May's contract was selected as expected ahead of his scheduled big-league debut Friday against the Padres.
The 21-year-old made just five starts at the Triple-A level before earning his second promotion of the year. In 20 starts across the two highest levels of the minors this season, May owns a 3.37 ERA, and his 24.6 percent strikeout rate and 6.5 percent walk rate are strong numbers. He has the potential to be a future mid-rotation starter or better, with good command backing up an excellent fastball/slider combo and two other potentially viable off-speed pitches.