ROCHESTER -- Aaron Laffey hated to see June come to an end.
The Buffalo Bisons' left-hander became the first pitcher in the modern era to win six games in a month as he beat Rochester, 4-1, on Saturday night before 10,867 at Frontier Field.
Laffey (6-3) scattered six hits over 8 1/3 innings and had a season-high nine strikeouts. Reliever Mike Koplove recorded the final two outs in the ninth to get the save.
It was the most strikeouts by a Bison pitcher this season. The last Herd pitcher to win five games in a month was Tim Drew (5-1, May 2002).
In six starts in June, Laffey had a 0.87 ERA, allowing just four earned runs in 42 innings. He posted more strikeouts (38) than hits allowed (30). Laffey had four 1-2-3 innings and even recorded the final out of the eighth by making a behind-the-back grab of a grounder.
Rochester was clinging to a 1-0 lead in the fourth when Bison all-star Ryan Mulhern crushed his 12th home run to tie it.
Buffalo took the lead for good with two runs in the sixth. Andy Marte's single to left scored Luis Rivas and Yamid Haad followed with a sacrifice fly to score Mulhern.
Buffalo added a run in the seventh when Mulhern hit a sacrifice fly to score Jonathan Van Every.
The Bisons picked up a game on the Red Wings to increase their lead to three games in the International League's North Division.
The Bisons are 3-2 against Rochester this season.
The teams play here again tonight (7 p.m., Radio 1230, 1330 AM) before heading to Dunn Tire Park on Monday and Tuesday.