As we inch towards the halfway point of the fantasy baseball season and the All-Star break, we are starting to get a confident glimpse of who is overvalued and undervalued based on the cost to acquire their services in drafts or auctions this spring. Some performances have exceeded expectations, while others have fallen behind. And time is running out to change their fortunes.
Value is an ever-changing target, but we do have a snapshot in time to look at how we valued them in our drafts this spring. With about 70 games played for each team this season, it’s a good time to look at who is performing how we hoped, and who is falling behind.
This weekly piece will look at the past few weeks of fantasy baseball performances to see who should be considered overvalued and undervalued going forward. When necessary, I will reference the Fantrax top 400 rotisserie rankings for the 2026 fantasy baseball season.
More great Fantasy Baseball Analysis: Fantasy Baseball Waiver Wire | Weekly SP Rankings | Pitching Streamers | Two-Start Pitchers | Lineup Analysis | MLB Injury Report | Rookie Report | Advanced Stats | Under the Radar | Overvalued & Undervalued | Bullpen Report
Fantasy Baseball’s Most Overvalued Players
(Stats are up to date as of June 15)
Ketel Marte (2B – ARI)
There’s something going on in the desert with Ketel Marte and the Arizona Diamondbacks. After back-to-back seasons hitting at least .283 with at least 28 home runs and scoring 87 runs, Marte is finding it very hard to get on base. He is hitting just .255 with 11 home runs this season, but his OBP is just .307, more than 40 points below his career average. His walk rate is the lowest it’s been since the COVID season, and his hard-hit rate is down eight points from two years ago.
Nothing seems out of sync with his plate discipline. Those numbers are largely in line with career norms. It just looks like he has gotten into a terrible habit of hitting the ball on the ground (43.3%) and not in the air (34.6% fly balls, his lowest since 2021). Marte is 32 and has 1,300 regular-season games on his ledger, so this could be close to a cliff. However, there are more and more reports surfacing about how Marte is not happy with some of his injury treatments, and the club isn’t happy with the games he is sitting out.
It’s something to watch to see if it lingers in the second half.
Josh Naylor (1B – SEA)
I’m on record several places as being extremely confident that Josh Naylor will not have another 20-home run, 20-steal season as he did in 2025. And while I am still sweating that prediction (eight home runs and 13 steals so far), it’s literally everything else that has seen a nose-dive from his career season last year. Naylor is batting only .253 with just 27 runs and 32 RBI. After .295 with 81 runs and 92 RBI in 2025, it’s clear something is way off.
Some of it has to do with injuries. Naylor is battling shin and wrist injuries right now and sat out Tuesday with those ailments. But really, the power and the speed haven’t been consistent all year. Naylor has one steal since May 18. He has just two home runs since June 1. For fantasy managers hoping for another all-around, five-category season this year, he has left a lot of people wanting.
Fantasy Baseball’s Most Undervalued Players
Jake Bauers (1B/OF – MIL)
Jake Bauers has quietly become one of the biggest fantasy baseball values of the 2026 season because he has transformed into a legitimate middle-of-the-order power contributor. So far in the 2026 season, Bauers has posted a .276/.374/.519 slash line with 13 home runs, 46 RBI, 40 runs scored, and five stolen bases. That gives him an impressive .894 OPS and a 148 wRC+, all numbers that are the best of his career. He has bounced around a lot in his career, but he’s found a place to hit in Milwaukee.
The reason fantasy managers have overlooked him is that Bauers entered the year with a career .672 OPS and never fully developed into the power hitter he was expected to be. However, his 2026 production has shown a completely different hitter. He is getting on base, driving the ball hard, and contributing across multiple categories. His combination of power, patience, and just enough speed has made him far more valuable than his spring draft slot suggested.
Yandy Diaz (1B – TBR)
The group of 10 players who are hitting at least .300 this season is an interesting list. I bet you would guess Yordan Alvarez and Otto Lopez. However, I predict it would take you a long time to get to players like Ernie Clement, Willson Contreras, and Yandy Diaz, who is second in the AL in batting average (.314).
He has been in a production spot in the productive Rays’ lineup all season and drove in his 46th run recently to go along with 12 home runs and a .506 slugging percentage through 67 games. Diaz recently finished a stretch where he had hits in eight straight games straddling May and June, and he appears to be getting stronger as the season goes along.
The 34-year-old first baseman and designated hitter has the second-highest batting average of his career this season to go along with an elite hard-hit rate (44.8%) and barrel rate (8.1%). All of his expected statistics back up this strong start, so for those who drafted Diaz late in spring drafts, enjoy reaping the benefits of a potential 25-home run, 100 RBI season.
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