We have completed five months of the fantasy baseball season, and the fantasy playoffs are upon us. We can now solidly say who is overvalued and undervalued based on the cost to acquire their services in drafts or auctions this past spring. Some fantasy baseball player performances have vastly exceeded expectations, while others have not come close to reaching the value we thought they would have.
Value is an ever-changing target, of course, but we do have almost a whole season to look at their production compared to how we valued them in our drafts this spring. With about 24 games left for each team this season, it’s a good time to look at who were the best and worst of the year. This last piece of the season will look at all of 2026 fantasy baseball to see who were the most overvalued and undervalued players based on where we drafted them six months ago.
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 Undervalued Players
When necessary, I will reference the Fantrax top 400 rotisserie rankings for the 2026 fantasy baseball season.
(Stats are up to date as of August 31)
Jordan Walker (OF – STL)
Spring 2026 Ranking: 330
Current 2026 Fantrax Player Rater: 21
I don’t think you’ll find a bigger gap between preseason expectations and actual fantasy production than Jordan Walker. After hitting just six home runs with a .231/.305/.366 slash line in 130 games in 2025, Walker was an afterthought in fantasy drafts this spring and on most waiver wires except in deep leagues. However, through August 31, Walker is hitting .285 with 27 home runs, 97 RBI, 86 runs and 18 stolen bases, putting together five-category production we dreamed about when Walker was one of baseball’s top prospects.
Walker ranks in at least the 95th percentile in Statcast’s xwOBA, average exit velocity, barrel rate, and bat speed, a dramatic change from the player who struggled to consistently turn his raw power into production because he couldn’t get the ball in the air. His barrel rate per plate appearance has climbed to 9.4%, compared with 6.8% for his career entering 2026.
His 2026 performance isn’t simply the result of a lucky BABIP spike either (although it is very high). He is hitting the ball considerably harder and doing a better job of getting that power into the air. A player who was ranked 330th in the spring has been a top-25 fantasy player, making Walker arguably the clearest undervalued player of draft season.
Drew Rasmussen (SP – TBR)
Spring 2026 Ranking: 144
Current 2026 Fantrax Player Rater: 9
The Drew Rasmussen preseason ranking looks way too low in hindsight, but NO ONE knew he would be this good. In 2025, he posted a 2.76 ERA and 1.02 WHIP over 150 innings with 127 strikeouts, but fantasy managers apparently didn’t expect much improvement from a pitcher who had never been a major strikeout guy. Instead, Rasmussen has taken another step forward in 2026, posting a 2.95 ERA, 0.93 WHIP, and 149 strikeouts over 146.1 innings while going 14-5 in the win-loss column.
The most encouraging part is that the improvement isn’t just based on luck or good fortune. Rasmussen’s FIP sits at 2.90, almost exactly matching his 2.95 ERA, while his 9.2 K/9 is a significant jump from the 7.6 mark he posted last season. At the same time, his walk rate is better. It was 2.2 BB/9 in 2025 and is now just 1.7 this year. The result is a substantially better strikeout-to-walk profile and fewer balls put in play.
At 144th overall, Rasmussen would have been drafted as a useful but certainly replaceable pitcher. But since then, his combination of strikeouts, ratios, and wins has made him one of the most valuable pitchers in fantasy baseball. The Fantrax number 9 player ranking reflects just how good he has been for the entire 2026 season.
Fantasy Baseball’s Most Overvalued Players
Kyle Tucker (OF – LAD)
Spring 2026 Ranking: 16
Current 2026 Fantrax Player Rater: 257
Kyle Tucker entered 2026 as presumably one of the safest first- or second-round fantasy picks. Coming off a 2025 season in which he hit .266 with 22 home runs, 25 stolen bases, and a .377 OBP in 136 games, Tucker was moving into an excellent Los Angeles Dodgers lineup and was being drafted with the expectation that he could return to at least that level of production, with a boatload of RBI and runs.
Instead, the 2026 season has been a disaster. Through August 31, Tucker is hitting just .228/.326/.357 with 11 home runs, 57 RBI and nine stolen bases in 129 games. His .683 OPS is more than 150 points below the .839 mark he posted in 2025, while his slugging percentage has cratered from .464 to .357.
What makes the decline especially concerning is that this isn’t simply a case of a player being unlucky for a couple of months. Tucker struggled to generate contact while also providing considerably less power. He had already fallen to a .238/.336/.386 line with only four home runs through the first two months of the season, and the problems have persisted.
There are reasons to believe Tucker can rebound eventually. He remains an accomplished hitter entering his age-30 season. A top-20 pick producing like the 257th player on the Fantrax ranking makes him the most overvalued player of the year, particularly when the expected power and speed haven’t materialized.
Bryan Woo (SP –SEA)
Spring 2026 Ranking: 35
Current 2026 Fantrax Player Rater: 102
Bryan Woo was much better on Tuesday night against the Boston Red Sox, but he still gets the nod here over Paul Skenes (who was bad against the Giants on the same night). Woo was one of the more popular breakout candidates entering 2026 after an outstanding 2025 season. He went 15-7 with a 2.94 ERA, 0.93 WHIP, and 198 strikeouts over 186.2 innings, establishing himself as a legitimate stud fantasy starter. That performance pushed him all the way up to 35th overall in Fantrax’s preseason rankings.
The problem is that Woo hasn’t been remotely as effective this season. Through August 31, he is 9-9 with a 4.36 ERA and 1.10 WHIP over 142.1 innings, with 142 strikeouts. His strikeout rate has fallen from 9.6 K/9 in 2025 to 8.9 K/9 this season. That isn’t a catastrophic change, but when combined with a substantial increase in ERA, they make it difficult to justify his preseason top-40 price.
Woo still has enough strikeout ability and underlying skill to be useful, but a pitcher ranked 35th overall should be providing considerably more than a 4.36 ERA. His No. 102 ranking on the Fantrax ranking shows just how much value he lost this season.
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