Their two performances yesterday were nothing like what these players are used to doing. Sabathia walked five batters yesterday, and he averaged 2.1 walks per nine innings last season. Teixeira went 0-for-4 with five runners left on base, and Teixeira drove in 121 runs last season.
I wouldn't care if the Yankees lost to my JV high school team yesterday, it's still just one out of 162 games in the season. I don't care if you have the nerves of Mariano Rivera, you will feel pressure if you are trying to earn your entire contract in just one game. For Sabathia and Teixeira, that's $341 million on their shoulders.
I expect Sabathia to put up 18+ wins and have pitch 210+ innings, and one bad start is not going to prevent him from achieving those numbers. And for Teixeira, I see him hitting .300 with 30 HRs and 120 RBIs.
I'm not worried after one way overhyped game, and neither should you.