Happens all the time. With a 2-1 lead in the 12th I just defeated a team that had Mariano Rivera trying to close me out when my amazing .211 hitter belted a double off of him scoring a walk from first. Mariano then lost when Tori Hunter hit a single scoring the runner from second on a hit and run.

Rivera surrenders a walk and two hits in the bottom of the inning surrendering two to loose - its going to happen. ;)

And hey, what about my team in their last series - I surrendered 10 home runs in a single game! Don't think that's ever been done before :D