When the Yanks capped off their comeback win on Sunday against the Mariners, Mariano Rivera, as he has for so many games since 1997, was on the mound when the last out went up on the scoreboard. That day, Rivera completed his 20th inning of work this season without allowing a walk, and Tyler Kepner noted in a Bats blog post the greatness of Rivera. Mo, you see, gives pitching lessons to the Yanks, and he may very well be responsible for turning Edwar Ramirez into a useful cog in the bullpen. When Mo calls it quits in a few years, I hope the Yanks can convince him to stick around as a pitching coach. He’s got one valuable mind for the game.