Buschmann, who finished with 20 points, was 4-2 with a 2.13 ERA in six May starts for the Biscuits and, after a final-day promotion, threw 2 2/3 perfect innings for Triple-A Durham on Friday. Buschmann landed in the daily rankings five times after his seven appearances.
Montgomery starter Merrill Kelly was second with 16 points based on the five quality starts he made in the month. He was one point ahead of Bowling Green's Taylor Guerrieri.
Bowling Green's Tommy Coyle, the April BCS/RPI champion, is first on the full-season list ahead of Toles.
20 points: Matt Buschmann
16: Merrill Kelly
15: Taylor Guerrieri
13: Wil Myers, Andrew Toles
11: Vince Belnome, Marty Gantt
10: Jeff Ames, Kevin Kiermaier, Jeff Malm
2: Jeff Ames, Vince Belnome, Matt Buschmann, Taylor Guerrieri, Jeff MalmDays in rankings
5: Matt Buschmann, Merrill Kelly, Kevin Kiermaier
4: Taylor Guerrieri, Wil Myers, Andrew Toles
31 points: Tommy Coyle
27: Andrew Toles
26: Vince Belnome, Matt Buschmann, Marty Gantt
22: Taylor Guerrieri
21: Sean Bierman, Merrill Kelly
18: Ryan Carpenter, Kevin Kiermaier