I agree with SB, you have Joba who is proven in that sort of role. There are always badass' in the minors on their way up, but once they get here it's impossible to predict how they will handle the pressure against full rosters of guys who were also badass' on their way up. Especially in the pressure-filled situation of the closers role. Yankee fans have definitely been spoiled with Rivera, so don't think it's so easy to replace him.