Bernie Williams hit his career-high 30th home run as the Yankees cut their magic number for winning the AL East to three over Toronto, which lost to Tampa Bay 6-0.
Pettitte (19-8) improved to 100-54 since making his major league debut with New York in 1995. He also gave himself a chance to win 20 this season, with his final start next weekend at Baltimore.
Pettitte became the 15th pitcher to record 100 victories with the Yankees, and first since another lefty from Louisiana Guidry
reached the mark in 1982. Mel Stottlemyre and Fritz Peterson are the only other New York pitchers to earn their 100th wins with the Yankees in the last 30 years.
Pettitte helped himself out with more than his pitching. He snared Brad Ausmus' liner at his hip, and also posted his fourth pickoff of the season and 54th of his career when he trapped Dusty Allen off first base.
Williams opened the second with a drive over the right-field wall, breaking his career high of 29 homers set in 1996. After Jorge Posada singled one out later, Martinez homered.
Martinez, who began the game in a 1-for-33 slump, hit a two-run homer in the eighth. It was the 14th multihomer game of his career and first this season.
The Tigers scored a strange run in the third. Shane Halter walked with two outs and should've made it home easily when Jose Macias tripled off the left-field wall.
Halter fell face-first halfway between and third and home, and tried to scramble back to third. But with Macias and the ball going there, he appeared trapped. Third baseman Scott Brosius, however, caught the throw and had no idea what was happening behind him, allowing Halter to stroll home without a play.
Halter hit a two-run triple in the seventh, making it 4-3.
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