The move was a formality after Pettitte decided to pitch for the Yankees rather than retire, then accepted the team's offer of salary arbitration. The 35-year-old left-hander had turned down a $16 million player option last month, saying he needed more time to make his decision.
Pettitte was 15-9 with a 4.05 ERA this year in his return to the Yankees following three seasons with his hometown Houston Astros. He went 11-3 after the All-Star break.
New York still has incomplete deals with third baseman Alex Rodriguez, closer Mariano Rivera and reliever LaTroy Hawkins.
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