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Pettitte hasn't exactly faced the stiffest competition.
2012 stats: 21.1 IP, 2-1, 19 K, 2.53 ERA, 1.08 WHIP
Andy Pettitte looks like he hasn't missed a beat since rejoining the New York Yankees.
But, he hasn't exactly faced playoff-quality teams so far, other than the Reds. He gave up four runs to the Mariners at home and then pitched very well against the Royals at home.
In fact, he hasn't made a road start yet. That's something to keep in mind.
Also, his K/9 rate is the second best it's been in his career. It's at 8.02, and his career high is 8.57, done in 2004 with the Astros. Furthermore, his FIP is 4.36, which is almost two runs higher than his ERA.
The biggest red flag: His left-on-base percentage is 97.7 percent. That's absurd. That's obviously going to come down, which means his ERA will increase.
I like Pettitte. I think he's a pretty good play, but you can use his hot start to your advantage right now. Perhaps the big Yankees fan in your league will overpay for him.