Left-hander and Dodgers No. 15 prospect Caleb Ferguson, pitching for Double-A Tulsa less than two weeks ago, makes his Major League debut on Wednesday at PNC Park at 4:05 p.m. PT against the Pirates. Ferguson was 3-0 with a 1.53 ERA in 10 combined starts at Tulsa and Triple-A Oklahoma City. The Bucs will send right-hander Trevor Williams (5-3, 3.84 ERA) to the mound.