It was kind of a no-brainer to sign Mark Teixeira after the 2008 season. He was just entering his prime and brought stability to a position that the Yankees struggled to fill consistently since Tino Martinez left.
On top of that Teixeira was fresh off his impressive first post season, the 2008 ALDS where he hit .467 with a 1.017 OPS against Boston.
However since Teixeira got here he has not hit at all in the playoffs.
Over 26 games he is hitting just .165 with a .560 OPS. He has had a moment or two, like the game winning home run in game two of the 2009 ALDS or last seasons ALDS vs the Twins where he hit .308 with a .973 OPS, but by and large he has been a disappointment.
Alex Rodriguez picked up the slack for him in 2009, but he couldn’t pick up the slack for him last season against Texas and there is a real chance that he won’t be able to do it this post season either.