Your definition of fantasy baseball sleeper might vary, but the following list contains undervalued players when compared to ADP.
Go here for my American League fantasy sleepers.
Arizona Diamondbacks: Brandon Pfaadt, SP
Pfaadt struggled after initially getting called up to Arizona last season, but he recorded a 19.1 K-BB% after the All-Star break that would’ve ranked top-15 among starters. He then posted a 3.27 ERA and a 1.09 WHIP with a 24.1 K-BB% (that would’ve ranked behind only Spencer Strider in 2023) over five starts in the playoffs.