Your definition of fantasy baseball sleeper might vary, but the following list contains undervalued players when compared to ADP.
Baltimore Orioles: Jackson Holliday, SS
Holliday was the No. 1 pick in the 2022 draft and is coming off a strong season across the minors. He posted a .396 OBP with impressive plate discipline as a 19-year-old in Triple-A, and projection systems call for the rookie to be an above-average hitter right away. Holliday has 15/15 potential yet is available 200+ picks into Yahoo drafts.
Boston Red Sox: Kutter Crawford, SP/RP
Crawford posted a 3.