Recent retiree Andy Pettitte is expected to make his return to the major leagues on Sunday vs. the Mariners. He has not pitched since October 18th, 2010. Pettitte who came out of retirement in mid-March will be turning 40 in a month. He comes into a Yankee team who has struggled recently with some of their starting pitchers as two of their starting pitchers have gone down with injuries, one of them being season-ending. The Yankees started today with a record of 16-13 and 2.5 games behind first place. Their team E.R.A. (earned run average) is 4.29 which is 24th overall in the MLB. With Andy Pettitte coming in, their E.R.A. should go down and their winning percentage should go up.