Ryan Kirksey | Mon, Mar 24th 2025, 7:00am EDT

Fantasy Baseball All-Undrafted Team: Waiver Wire Sleepers (2025)

Most fantasy baseball teams will have 10 or 12 teams with an average of 23 players per roster. That means that between 230-275 players are drafted in a standard fantasy squad, meaning there are about 500 Major League Baseball players left undrafted. Below is the best team from those undrafted players. After the last pick has been made, there are still plenty of valuable players left on waivers. Consider these, if you will, sleeper picks for fantasy baseball or picks you can target on the waiver wire if your team suffers an injury or poor performance to start the season.

All ADP information is taken from the FantasyPros expert consensus ADP page.

All-Undrafted Team 2025

Keibert Ruiz (C – WSH)

For drafters who wait until the very end to grab a catcher, the most important thing to look for is opportunity, playing time, and potential. Ruiz can claim each of these. He has at least 485 plate appearances in each of the last two seasons. He had at least 13 home runs in 2023 and 2024 and he had enough bad luck in 2024 that if it shifts back in his favor, this could be a career year at age 26.

Ruiz suffered with a .232 batting average on balls in play (BABIP) last season which led to a .229 average. His career number is 25 points higher, so if nothing else, the average and on-base percentage should improve. Ruiz killed it in Spring Training, carrying a .282/.318/.513 slash line with three homers and a steal. It’s possible that as he enters his prime, this could be his best season yet.

Tyler Soderstrom (1B – ATH)

If there is one offense that has the potential to be sneaky good for fantasy baseball in 2025, it is the Athletics (now playing games in Sacramento). Lawrence Butler, Brent Rooker, JJ Bleday, and Shea Langeliers all have big upside and by the end of the season, Tyler Soderstrom’s name could be added to that list. In a third of an MLB season last year, he hit nine home runs and drove in 26 runs. That was at just 22 years of age, and he has the full-time gig to himself in 2025.

All of the Athletics’ hitters should improve just by moving out of the Oakland Coliseum, but Soderstrom’s lefty stroke should play especially well in the Sacramento minor league park. While there is some potential platoon risk here, Soderstrom’s hard-hit rate of 50% last season should get him in the lineup most days.

Kristian Campbell (2B – BOS)

Prized prospect Kristian Campbell had a very slow start to spring training in his battle to win the second base job for the Boston Red Sox, but he has started mashing lately, including his first home run of the spring on Saturday. With Vaughn Grissom sent down to AAA already and Masataka Yoshida starting the year on the IL, the door seems to be wide open to Campbell winning at least a place on the roster, just as his performance is starting to improve.

Across three levels in 2024, Campbell slashed .330/.439/.558 with 20 homers and 24 steals. Expecting anything close to that is foolish, of course, but it shows the potential he has at just 23 years old. What we must wait and see is how the Red Sox choose to define their approach with him. Let him play every day and take his lumps? Or start him out slowly and let him adapt? Whichever way they go, Campbell is going to be a star at some point, and all it takes is Pick #296 in drafts right now.

Ke’Bryan Hayes (3B – PIT)

Maybe I’m chasing the elusive 15-home run, 25-steal season that always seems to be in reach of Ke’Bryan Hayes, but at Pick #358 in drafts, there is almost no risk to grabbing Hayes to see if this is the year that he finally puts the speed and power together. He has been honing his craft at the plate, leading to a lower strikeout rate in each of the last four seasons, but he just has to get the ball in the air more to reach his full potential.

Hayes has groundball rates of at least 49% in three of the last four seasons, which limits his upside. However, he was knocking on the door of a 30% flyball rate in the second half of 2024, so hopefully those gains stick. Even if nothing improves, you can count on a .250-.260 average, and double-digit steals and home runs.

Jose Caballero (SS – DET)

Does Jose Cabellero have a starting job for Tampa Bay on Opening Day? Likely not. Taylor Walls will play shortstop and Brandon Lowe has second base locked down. However, Cabellero is the first super-utility man off the bench and Roster Resource actually has him projected for more plate appearances than Walls or backup infielder Curtis Mead.

Caballero is a potential league-winner in stolen bases. Last season, he led the American League with 44 steals with just 482 plate appearances. He is one injury or major slump on the Rays from having 50-steal upside at an ADP of 312 right now. He may not offer much in terms of power or run production, but if your team is desperate for steals in your draft’s endgame, Caballero is the best option.

Jesus Sanchez (OF – MIA)

After Pick #200 in fantasy baseball drafts, there are not many players who have the potential for a 20/20 season if things break right. Miami Marlins outfielder Jesus Sanchez, however, is one of those players. Sanchez has increased his home runs for three straight seasons, culminating in 18 last year. He combined that with 16 steals in a never-before-seen display of speed. The question in his age-27 season is can he do it again?

Sanchez made tremendous gains in OBP and SLG in the second half of 2024 (.718 OPS in the first half, .745 in the second). He also was lucky on the health front with 149 games played and 537 plate appearances. If he can remain healthy again and keep running, he will far outpace his current ADP of 287.2.

Jose Soriano (SP – LAA)

One of the deep sleeper darlings for pitchers in 2025 is Jose Soriano of the Los Angeles Angels. In his first two parts of Major League seasons, he has reached the following milestones in at least one of them: 12.00 strikeouts per nine, 0.64 home runs per nine, 60% ground ball rate, 1.20 WHIP, and 99 miles per hour on his fastball. What fantasy baseball drafters are looking for is if Soriano can put all these things together in one year to become a star.

At Pick #364 in consensus drafts, it costs basically nothing to find out. In most leagues, Jose Soriano will be available on waivers to start the season and it could be worth watching a start or two to see how his arsenal and his velocity look to begin the year.

Calvin Faucher (RP – MIA)

There are plenty of Miami Marlins available after Pick #275 because 1) their offense is not projected to be very good, and 2) they are not projected to win many games. That could lead to only a small number of save chances for reliever Calvin Faucher, but he is far and away the best reliever in this bullpen and proved at the end of 2024 that he can handle the ninth inning.

Faucher closed 2024 with six saves at the end of the year and had 10.57 strikeouts per nine innings. While we would want his walk rate to come way down (over 4.00 walks per nine the last three seasons), Faucher did not give up a single home run in 2024, which helped him to a 3.72 ERA. It might not be pretty at times, but there are likely to be 20 saves here at the end of the season unless he is traded to a contender.

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