May is the organization's 8th-ranked prospect, according to Baseball America. The 24-year-old right-hander was a fourth-round pick in the 2008 draft.
In 95.1 innings at AAA this year, May is 8-6 with a 2.93 ERA. He's struck out 8.59 batters per nine innings, and his 91 total strikeouts are the second most on staff.
Minnesota is 51-62 and in last place in the AL Central. Earlier this year, Baseball Prospectus ranked the Twins as the best farm system in baseball.
- Alex Hampl