One of my favorite Yankees is Mariano Rivera, arguably the best closer of all-time. The man has one "out" pitch (the "cutter"), everyone knows what it will be, and still, he saws off bats like no one else I have ever seen.
The guy has nerves of steel and from what everyone says, he is a good guy and a family man. Better yet, he's a professing Christian (there are several on the Yankees--Phil Hughes and Andy Pettitte to name a couple of others).
In any case, there's a great article on "Mo" in the New York Times magazine. The King of the Closers