NEW YORK -- There has been one constant to Martin Perez's performance since his return from 2 ½ months on the disabled list: His inconsistency. This is not the way for a guy with an option in his contract to roll towards the finish of the season. In a 7-2 loss to New York Sunday, Perez failed to make it through the sixth and followed the good start/bad start that has been the pattern to his injury-interrupted season.