May was promoted to Triple-A Oklahoma City on Thursday.
May will get his first taste of Triple-A after impressing in a return trip to Tulsa, compiling a 3.74 ERA, 1.15 WHIP and 86:20 K:BB in 79.1 innings (15 starts). The 21-year-old righty is scheduled to make his debut with Oklahoma City on Sunday against Triple-A Nashville.