Bob Baffert’s three-year suspension from the Kentucky Derby ends this year, and the Hall of Fame trainer is already molding a feared collection of promising horses that should contend for the 151st Run for Roses on the first weekend in May.

Mr. Baffert’s suspension from Churchill Downs for a failed drug test that ultimately disqualified 2021 Kentucky Derby winner Medina Spirit was lifted last summer. The hostility between the trainer and the storied racetrack ended when Mr. Baffert took responsibility after he unsuccessfully sued Churchill Downs last year in an attempt to enter one of his horses, Muth, in the 150t Derby.