Pettitte allowed two hits in four innings for the Trenton Thunder in an Eastern League playoff game. He struck out four against the New Hampshire Fisher Cats.
Pettitte threw 51 pitches, 37 for strikes. He also uncorked two wild pitches.
A healthy Pettitte is considered crucial to the Yanks' chances of repeating as World Series champions. The 38-year-old Pettitte is 11-2 with a 2.88 ERA in 18 starts.