DYNASTY BASEBALL: 2026 San Francisco Giants Top 20 Fantasy Baseball Prospects

The San Francisco Giants are entering a fascinating new chapter under President of Baseball Operations Buster Posey and General Manager Zack Minasian. Rather than chasing short-term fixes, the new leadership group has placed greater emphasis on building a sustainable talent pipeline through the draft, international market, player development, and opportunistic trades. For dynasty fantasy managers, that creates a system that is rewarding to follow, as you’ll see in the Giants’ Top 20 fantasy baseball prospects profiled ahead.

2026 San Francisco Giants Top 20 Fantasy Baseball Prospects

The Giants’ new direction is beginning to reshape the farm system. San Francisco has added premium young talent such as Josuar Gonzalez and Luis Hernandez internationally, invested high draft picks in players like Gavin Kilen and Jackson Flora, and used the 2026 trade deadline to bring additional upside into the organization. The result is a system increasingly populated by athletic position players, power-speed threats, and pitchers with legitimate swing-and-miss weapons.

For dynasty fantasy managers, this is an organization worth watching closely. The Giants’ system offers an intriguing mixture of high-ceiling teenagers, rapidly developing prospects, and upper-level players approaching major-league opportunities. Posey and Minasian are still establishing their developmental track record, but the organization’s recent willingness to invest aggressively in young talent makes San Francisco a system with the potential to produce several significant dynasty assets over the next few seasons.

So, let’s begin with our countdown of the Giants’ top 20 prospects.

No. 20 — Parks Harber | 3B/1B (ETA 2027)

Harber has gone from undrafted free agent to one of the more intriguing bats in San Francisco’s system, riding legitimate impact contact and plus raw power all the way to Triple-A. The 6-foot-3 right-handed hitter consistently produces strong exit velocities and has the strength to drive the baseball to all fields, giving him a realistic path to 20-plus home runs at peak.

For dynasty managers, the appeal is almost entirely in the bat. Harber combines power with enough patience to post useful on-base percentages, but his ability to handle quality velocity and breaking stuff will determine whether he becomes an everyday hitter or settles into a smaller role.

At 24, there isn’t much projection left, but the combination of proximity, power, and sustained minor-league production gives him a plausible corner-regular ceiling and makes him worth rostering before a potential MLB opportunity drives up his price.

No. 19 — Joe Whitman | LHP (ETA 2026)

Whitman is a polished 6-foot-4 lefty whose fantasy appeal revolves around his slider, command, and ability to miss enough bats to remain a starter. His low-80s slider is his best weapon, while a fading changeup gives him another option against right-handed hitters.

The biggest question is the fastball. Whitman generally works in the low 90s, and the pitch has been hittable against advanced competition, putting pressure on his secondary stuff and location. Still, his strike-throwing and three-pitch mix give him a realistic path toward the back of an MLB rotation.

For dynasty managers, Whitman is more floor than ceiling, but his proximity to San Francisco makes him interesting in deeper formats. He has already reached Triple-A and could provide useful strikeouts as a No. 4/5 starter, though improving the fastball will be critical if he’s going to become more than a streaming fantasy arm.

No. 18 — Carson Whisenhunt | LHP (ETA 2027)

Whisenhunt’s calling card is a devastating changeup that gives him legitimate bat-missing upside. The pitch features excellent deception and late tumble, allowing it to play as a true weapon against hitters from either side, while his low-90s fastball and slider round out the arsenal.

The concern is whether the rest of the repertoire is good enough to support that premium changeup. His fastball can become vulnerable when the velocity dips, and the breaking ball remains inconsistent, leaving his command and pitch sequencing critical to surviving multiple trips through a major-league lineup.

In dynasty leagues, Whisenhunt profiles more as a useful fantasy starter than a future ace, with strikeouts providing most of the appeal. He has already been called up and optioned down by San Francisco and should continue competing for rotation innings, giving him immediate value in deeper leagues with the upside to develop into a solid back-end fantasy SP if the secondary pitches improve.

No. 17 — Kaden Waechter | RHP (ETA 2030)

Waechter is a projectable 6-foot-3 right-hander with an unusually polished foundation for a prep arm. His fastball generally sits 92-94 mph and can reach 95-96, pairing well with a sharp mid-80s slider that gives him a legitimate swing-and-miss weapon.

What makes Waechter especially intriguing is the combination of athleticism, command, and remaining physical projection. He already throws strikes at an advanced rate and shows feel for a changeup, giving him the ingredients for a starter’s repertoire if additional velocity arrives as he matures.

Waechter is a long-term upside stash rather than a quick return on investment. There’s plenty of developmental risk with an 18-year-old pitcher, but his strike-throwing, fastball/slider foundation, and potential for more stuff give him a realistic mid-rotation ceiling with room to exceed it.

No. 16 — Trevor Cohen | OF (ETA 2028)

Cohen is a polished left-handed hitter whose standout skill is putting the baseball in play. His compact swing, excellent bat-to-ball ability and patient approach give him the foundation to hit for average and reach base at a strong clip, making him especially appealing in OBP dynasty formats.

Power is the obvious limitation, but Cohen brings another fantasy weapon with his legs. He’s an instinctive runner with enough speed to become a consistent stolen-base contributor, and his ability to handle center field should give his bat more opportunities to reach the majors.

Cohen profiles as a high-floor sleeper with AVG/OBP and stolen-base upside rather than a future fantasy star. If San Francisco can help him lift the ball more consistently and unlock even 10-15 homer power, his combination of contact and speed could make him a sneaky five-category contributor.

No. 15 — Carson Bolemon | LHP (ETA 2030)

Bolemon is an advanced young lefty with the ingredients to develop into a quality big-league starter. His best weapon is a sharp, high-spin curveball, while a promising slider gives him a second breaking pitch capable of generating strikeouts as he climbs the minors.

The biggest variable is his fastball. Bolemon has previously reached the mid-90s but experienced a velocity dip during his draft year, making the return of that harder heater important to his ceiling. Fortunately, his command, deep four-pitch arsenal and feel for sequencing are unusually polished for a teenage arm.

Bolemon is a high-upside pitching stash with considerable patience required. If the velocity rebounds and his breaking pitches continue missing bats, he has the ceiling of a mid-rotation starter with strong strikeout potential, though the lengthy development timeline and inherent risk of prep pitching keep him firmly in deeper-league territory.

No. 14 — Keyner Martinez | RHP (ETA 2028)

Martinez has emerged as a legitimate breakout arm, attacking hitters with a mid-90s fastball that can reach 98 mph and a sweeping slider capable of piling up whiffs. Both pitches project as plus offerings, giving him the swing-and-miss foundation dynasty managers should be chasing in young pitchers.

The development of his changeup and command will determine whether Martinez reaches his ceiling. His changeup remains behind the fastball-slider combination, while inconsistent strike-throwing has surfaced against more advanced competition, creating some long-term bullpen risk.

Martinez is a high-upside pitching stash with legitimate strikeout potential. If the changeup develops and his command stabilizes, he could become a mid-rotation starter with well-above-average strikeout production; if not, his electric two-pitch combination could eventually push him toward a late-inning relief role.

No. 13 — Kaeden Kent | SS/2B/3B (ETA 2028)

Kent joined the Giants at the 2026 trade deadline in the deal that sent Heliot Ramos to the Yankees, with left-hander Henry Lalane also coming to San Francisco. The son of former Giants star Jeff Kent, Kaeden brings a smooth left-handed swing, strong bat-to-ball skills, and an advanced approach that gives him a chance to hit for average and reach base consistently.

Kent is polished, who stands out for his smooth swing, line-drive contact, and ability to use the entire field. He rarely looks overmatched at the plate, and his combination of bat-to-ball skills and improving plate discipline gives him a chance to develop into a big everyday contributor.

The offensive ceiling will depend on how much power Kent unlocks. He has enough strength to eventually reach the 15-20 homer range, but his swing currently produces more hard liners than loft, while his defensive versatility could help him find everyday at-bats somewhere around the Giants’ infield.

Kent is an intriguing high-floor sleeper with sneaky five-category potential. He may never become a major power threat, but a future featuring a useful batting average, double-digit homers, and some stolen bases could make him a valuable middle-infield option in deeper fantasy leagues.

No. 12 — Jacob Bresnahan | LHP (ETA 2028)

Bresnahan is a physical left-hander with a rising three-pitch arsenal and increasingly intriguing strikeout upside. His riding low-90s fastball plays above its velocity, while a fading changeup has developed into his premier weapon and gives him a legitimate pitch for missing bats.

There’s still some developmental risk tied to his command, but Bresnahan has the size, athleticism and repertoire to remain in the rotation. His slider provides another useful look, and improved strike-throwing could allow his fastball-changeup combination to become even more effective against advanced hitters.

Bresnahan is a rising pitching stash with mid-rotation upside and strong strikeout potential. Young pitching always carries volatility, but his improving stuff and starter traits give him considerably more fantasy ceiling than the typical back-end organizational arm.

No. 11 — Miguel Mendez | RHP (ETA 2027)

Mendez brings the kind of electricity dynasty managers should notice, featuring a lively 95-98 mph fastball that can touch triple digits. Mendez joined the Giants at the 2026 trade deadline in the deal that sent Robbie Ray to the Padres, with young infielder Joniel Hernandez also coming to San Francisco. His hard slider gives him a second bat-missing weapon, creating a fastball-breaking ball combination capable of producing plenty of strikeouts.

The question is whether Mendez can remain a starter. His changeup still trails the two power pitches, while inconsistent command and a history of shoulder trouble add considerable risk. Developing that third offering and consistently attacking the strike zone will be crucial to turning his raw stuff into rotation innings.

Mendez is a high-risk, high-upside pitching stash with immediate proximity. His ceiling is an impact strikeout starter if everything clicks, but the fallback could be a power reliever whose fastball-slider combination plays extremely well in shorter bursts.

No. 10 — Bo Davidson | OF (ETA 2027)

Davidson brings an exciting power-speed blend from the left side, combining explosive bat speed with the strength to drive balls out to any part of the park. His plus speed adds another fantasy weapon, giving him legitimate 20-homer, double-digit-steal potential if his bat continues translating against advanced pitching.

The biggest question is whether Davidson makes enough consistent contact to maximize those tools. His approach has improved as he’s climbed the minors, but swing-and-miss remains something to monitor, while his athleticism and strong arm give him a chance to handle center field or become a quality corner defender.

Davidson has the ingredients of a high-upside five-category sleeper who is getting close to San Francisco. There’s some batting-average risk, but his combination of power, speed, and upper-minors success gives him considerably more fantasy ceiling than the typical late-blooming outfield prospect.

No. 9 — Henry Lalane | LHP (ETA 2028)

Lalane joined the Giants at the 2026 trade deadline in the deal that sent Heliot Ramos to the Yankees, giving San Francisco another high-upside arm for its system. The towering 6-foot-7 lefty features a mid-90s fastball that can reach 98 mph and a fading changeup with a legitimate swing-and-miss arsenal.

Health is the major variable after shoulder problems disrupted multiple seasons and eventually required surgery. His slider and command also need refinement, but the improved velocity and three-pitch foundation give Lalane a legitimate chance to develop as a starter rather than being pushed into relief.

Lalane is a high-upside pitching stash with considerable risk attached. If his health holds and the command progresses, the fastball-changeup combination could produce strong strikeout totals and a mid-rotation fantasy starter, making him an appealing arm to roster before he reaches the upper minors.

No. 8 — Dakota Jordan | OF (ETA 2028)

Jordan is a premium athlete with the explosive bat speed and strength to produce loud fantasy numbers. His plus raw power is the headliner, but above-average speed gives him legitimate power-speed upside and a path toward contributing in both home runs and stolen bases.

The swing remains the key to unlocking that ceiling. Jordan can expand the zone and will always carry some strikeout risk, but he produces exceptional exit velocities when he connects and has made encouraging progress turning his immense physical tools into more consistent game production.

Jordan is a high-upside, high-variance outfield prospect worth betting on. If the approach continues improving, there’s a realistic path to 25-homer power with double-digit steals, though batting-average volatility keeps the floor considerably lower than the ceiling.

No. 7 — Gavin Kilen | SS/2B (ETA 2028)

The Giants made Kilen a major piece of their emerging young core when they selected him 13th overall in the first round of the 2025 MLB Draft out of Tennessee.

Kilen is a hit-first middle infielder with a quick left-handed swing and exceptional feel for finding the barrel. His advanced bat-to-ball skills give him a chance to hit for a strong average, while steadily improving power could eventually push him into the 15-homer range.

The fantasy ceiling isn’t built around massive power or elite speed, but Kilen has few glaring weaknesses offensively. He controls at-bats well, makes contact against different pitch types, and has enough athleticism to contribute some steals while qualifying at valuable middle-infield positions.

Kilen profiles as a high-floor prospect with everyday-player upside. His combination of batting average, moderate power, and some speed may be more steady than spectacular, but an offensive-minded second baseman capable of contributing across several categories could become a valuable fantasy asset.

No. 6 — Jackson Flora | RHP (ETA 2028)

Selected by the Giants with the No. 4 overall pick in the 2026 MLB Draft, Flora gives the Giants a potential frontline starter built around a premium upper-90s fastball that explodes through the zone. His deep arsenal also features a hard gyro slider, a sweeping breaking ball, and a promising changeup, giving him multiple weapons for generating strikeouts.

Beyond the velocity, Flora stands out for his athletic 6-foot-5 frame and ability to command a diverse repertoire. His secondaries still need professional refinement, but the combination of stuff, strike-throwing, and collegiate polish gives him a strong chance to remain a starter as he moves quickly through the minors.

Flora is a high-ceiling pitching prospect with SP2 upside and considerable strikeout potential. College experience should shorten his developmental timeline, and if the secondary pitches continue progressing behind his plus-plus fastball, he has the arsenal to become one of San Francisco’s most valuable fantasy starters.

No. 5 — Marcelo Mayer | SS/3B (ETA 2026)

Mayer joined the Giants at the 2026 trade deadline in a deal that sent Erik Miller and Carlos Gutierrez to the Red Sox, giving San Francisco a buy-low opportunity on a former elite prospect. The former No. 4 overall pick brings a smooth left-handed swing, strong plate skills, and enough raw power to develop into a 20-plus homer infielder.

The talent remains enticing, but injuries and inconsistent production have slowed Mayer’s ascent. He still has the bat speed and approach to become an everyday hitter, while his ability to handle shortstop and third base should create multiple paths to regular playing time once healthy.

Mayer is a change-of-scenery gamble with considerable post-hype upside. He has already reached the majors, so there’s less projection and more urgency than with a traditional prospect, but a healthy Mayer could still develop into a useful AVG/OBP contributor with 20-homer potential at premium fantasy positions.

No. 4 — Jhonny Level | SS (ETA 2029)

The Giants signed Level out of Venezuela for $997,500 in January 2024, and the switch-hitting shortstop has quickly developed into one of the system’s most exciting young bats. His quick hands, impressive bat speed, and natural feel for the barrel give him a chance to hit for average while developing 20-homer power.

Level’s fantasy appeal extends beyond the bat, as his athleticism and above-average speed give him legitimate stolen-base potential. He also controls the strike zone well for his age, while a strong throwing arm and smooth actions give him a chance to remain at shortstop as he matures.

Level offers an enticing power-speed ceiling at a premium position. There’s plenty of developmental distance remaining, but the combination of contact ability, emerging pop, and speed gives the 19-year-old the upside to become a valuable five-category fantasy shortstop.

No. 3 — Ramon Marquez | RHP (ETA 2028)

Marquez joined the Giants at the 2026 trade deadline in the deal that sent Luis Arraez and Caleb Kilian to the Phillies, immediately becoming one of San Francisco’s highest-upside arms. His fastball sits around 94-96 mph and can reach 98, but his fading changeup is the real showstopper and already looks like a potentially dominant swing-and-miss pitch.

The 20-year-old complements those weapons with an upper-80s cutter and encouraging strike-throwing ability. His changeup is advanced enough to overwhelm lower-level hitters now, while continued refinement of the cutter and durability will determine whether he develops into a frontline starter or settles closer to the middle of a rotation.

Marquez is a high-upside pitching prospect with legitimate strikeout impact. Young arms always carry volatility, but his combination of velocity, a potentially elite changeup, and rapidly rising prospect stock gives him the ceiling to become one of the most valuable fantasy pitchers in San Francisco’s system.

No. 2 — Luis Hernandez | SS (ETA 2030)

Hernandez signed with the Giants for nearly $5 million as the top-ranked international prospect in the 2026 class, giving San Francisco another potential cornerstone at shortstop. His advanced pitch recognition, quick right-handed swing, and impressive barrel control are exceptional for his age, with enough bat speed and strength to eventually develop 20-plus homer power.

Hernandez is more polished than the typical teenage prospect, consistently making smart swing decisions and producing quality contact against older competition. He isn’t a burner, but his instincts, strong arm, and smooth defensive actions give him an excellent chance to remain at shortstop while his offensive game develops.

Hernandez is a premium long-term stash with impact AVG/OBP and power potential at a valuable position. The distant ETA requires patience, but his combination of hitting ability, emerging power, and unusually advanced approach gives him the ceiling to eventually become a high-end fantasy shortstop.

No. 1 — Josuar Gonzalez | SS (ETA 2029)

The Giants landed Gonzalez for roughly $3 million as one of the premier international talents of the 2025 class, and the switch-hitting shortstop has quickly justified the investment. Explosive bat speed, improving barrel control, and emerging power give him exciting offensive upside, with the potential for considerably more pop as his frame matures.

Speed could be Gonzalez’s biggest fantasy weapon. He’s a true burner with the quickness to pile up stolen bases, while his athleticism, range, and strong arm give him an excellent chance to remain at shortstop. His advanced strike-zone awareness also provides an encouraging foundation for his future batting average and OBP.

Gonzalez has the ingredients of a potential five-category impact shortstop and one of the premier assets in the Giants’ system. There’s still substantial developmental risk with an 18-year-old, but the combination of contact, emerging power, and potentially elite stolen-base production gives him legitimate fantasy-star upside.

Final Thoughts

The Giants’ farm system suddenly has something dynasty managers should appreciate: multiple paths to impact fantasy talent. Josuar Gonzalez, Luis Hernandez, and Jhonny Level headline an exciting collection of young position players, while Jackson Flora, Ramon Marquez, and several other intriguing arms give the organization legitimate strikeout upside on the pitching side.

What makes this system especially encouraging is how the talent was assembled. Buster Posey and Zack Minasian have supplemented international investments and premium draft selections with aggressive trades, creating a prospect pool that now ranges from teenage lottery tickets to players knocking on the door of San Francisco.

There is still plenty of risk, particularly among the younger players, but the ceiling of this system has changed dramatically. For dynasty managers, this is no longer a Giants farm system to overlook—it’s one where buying into the right prospect early could pay significant dividends over the next several seasons.