Fantasy Baseball Waiver Wire: Waldschmidt, Cavalli Are Must-Adds

It’s hard to believe that we’re at the one-third mark of the fantasy baseball season. While that’s not an insignificant amount of time, there’s still plenty of time to improve our squads via the fantasy baseball waiver wire. Whether you need to play catch-up in a particular category or are looking for an injury replacement, the fantasy baseball waiver wire is our friend.

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This week’s fantasy baseball waiver wire includes a handful of recent call-ups that deserve our attention, as well as a couple of Nationals who can give our rosters a boost — on both sides of the ball. With that, let’s take a look at some Week 10 fantasy baseball waiver wire targets.

Week 10 Fantasy Baseball Waiver Wire Targets

Ryan Waldschmidt, OF, Diamondbacks (74%)

Ryan Waldschmidt has looked good since his call-up. While he’s yet to launch his first long ball in the majors, you can’t complain about his .302/.362/.413 slash line and five swipes across 19 games. Waldschmidt’s 30% strikeout rate isn’t ideal, but he’s also not swinging outside of the zone much, posting a sub-20% chase rate. Additionally, the rookie is barreling the ball at a 9.3% rate and pulling balls in the air at a solid 26.8% clip.

Waldschmidt doesn’t look overwhelmed at the plate, and once the results catch up with his underlying numbers, he offers a nice blend of power and speed. Combine that with a heart-of-the-order batting slot in a potent offense, and Waldschmidt should be scooped up in 12-teamers to see how this plays out.

Anthony Volpe, SS, Yankees (55%)

It’s unclear what Anthony Volpe’s playing time will look like once Jose Caballero returns from the IL. But in the meantime, Volpe has taken advantage of his at-bats. He has nine hits in 11 games, including three doubles and a home run, while going 2-for-3 on the basepaths. In those 44 plate appearances, Volpe is slashing .257/.409/.429 with a 20.5% walk rate and 22.7% strikeout rate. It’s a small sample size, but Volpe’s results make him an interesting spec add for those with roster space.

Jacob Young, OF, Nationals (30%)

Jacob Young has been a surprising source of power recently. He popped four homers over his last 12 games while sporting a .433 ISO and .333/.394/.767 slash line. He’s also smashing the ball in that stretch with a 16% barrel rate and 96.1 mph average EV.

Young has never been a big power bat, but he’s made some quality contact gains, which are helping his cause. He upped his barrel rate from 1.9% in 2025 to 6% and is elevating the ball more. The result so far is a career-high seven home runs on the year, and his groundball rate plummeted from 53.8% to a more palatable 39.7% rate. Assuming his improvements stick, Young could shape up as a sneaky power/speed play with 10/20 upside. His skillset plays well on a plucky Nats team that leads the league in runs scored and ranks third in stolen bases. Young is a solid add if you need OF help.

Spencer Horwitz, 1B, Pirates (47%)

The Pirates have been one of the hottest teams in May, thanks in no small part to Spencer Horwitz. He’s hitting .333 for the month with a .974 OPS and 171 wRC+ across 86 plate appearances. Horowitz contributed across the board in that stretch, tallying three homers in his last eight games to go with 10 runs scored, 15 RBI and a steal. He’s also flexing his usual elite plate skills with a 12.8% walk rate and 10.5% strikeout rate.

Horowitz’s value tends to be limited as he’s a strong-side platoon bat with low-to-mid-teens power and little speed. However, it’s worth noting that he drew starts against the last two southpaws the Pirates faced — and hit a dinger! Overall, Horwitz is a solid corner infield option. He’s an asset in the batting average column (career .272 BA) and is a strong play in OBP leagues (career .360 OBP). Horwitz is well worth considering while the Buccos are in a groove.

Jake McCarthy, OF, Rockies (38%)

Jake McCarthy was a sleeper pick of mine, given his ability to steal bases without tanking your batting average. Unfortunately, the veteran struggled to receive everyday playing time out of the 2026 gate. But since mid-May, McCarthy has been a lineup fixture for the Rockies while leading off against righties. His .240/.235/.280 slash in those 13 games isn’t anything to write home about. But McCarthy did pick up a couple of steals and made contact in the zone at a 92.2% clip.

McCarthy’s 98th percentile sprint speed has served him well. Across 46 games this season, he’s 9-for-11 on the basepaths to go with a .269 batting average. Prior to his derailed 2025 season, McCarthy stole at least 23 bags for three consecutive seasons. In that three-year span, he hit .273, got on base at a healthy .339 clip, and maintained a sprint speed in the top 2%. Basically, he did everything we want our speedsters to do. In 14-teamers, McCarthy is worth an add in case he can rekindle some of that magic while he’s getting at-bats.

Cade Cavalli, SP, Nationals (76%)

Cade Cavalli has been a frustrating arm to roster this season, but he finally looks like he’s found his rhythm. In his last three starts, he’s showcasing a 2.79 ERA (2.53 xFIP) and 1.03 WHIP across 19.1 innings. Cavalli also allowed a mere three walks to 23 strikeouts, which is good for a 26.9% K-BB. During that stretch, he earned three quality starts and two wins.

Cavalli has come on especially strong in the strikeout department since the end of April. He maintained a 12.4% SwStr% over his last seven starts, and his 50 Ks in that span rank third behind Cristopher Sanchez (56) and Jacob Misiorowski (58). Cavalli is already rostered in 74% of Fantrax leagues, but given his recent turnaround, that number should be higher. The state of quality pitching on the waiver wire is bleak, making Cavalli a must-add in all league sizes.

Gage Jump, RP, Athletics (57%)

The Athletics promoted top pitching prospect Gage Jump earlier this week. In his debut start against the Mariners, he allowed nine hits and four earned runs across five frames with 5:1 K:BB. Despite the mixed results, Jump is worth an add. The southpaw relies on a 96 mph swing-and-miss fastball that pairs well with his four other offerings, including a slider that generated a 45.5% whiff rate in his debut.

There will be ups and downs, but Jump brings an above-average arsenal to the table and strikeout upside. You’ll need to pick and choose where you use him, but his upcoming start against the Cubs is in play. The Cubbies have struggled in May to the tune of a .210 BA and own a bottom-of-the-barrel .510 OPS versus LHP for the month.

Spencer Miles, RP, Blue Jays (24%)

Spencer Miles has been excellent while filling in for an injured Max Scherzer. In three bulk relief appearances, he allowed a combined one earned run on seven hits with 14:4 K:BB across 12.1 innings. In that span, Miles maintains a shiny 0.73 ERA (2.58 xFIP), 0.89 WHIP and 21.3% K-BB while keeping the ball on the ground at a 62.1% clip.

Miles logged 4.1 innings in his last two appearances as the Blue Jays continue to ramp up his usage. He should stick around for at least a couple more starts, and is scheduled to face the Orioles twice in that stretch. Miles should be good for about a K per inning while generating a healthy dose of groundballs. And who knows? Miles could stick around longer, as Scherzer isn’t exactly a pillar of health these days.