there are a bunch of posts here about Takatsu, aka Mr. Zero.
Basically, the gist of all the threads is that he has been lights out all season, and that he'll wrack up a bunch of saves.
That said, his fastball is weak, and for a closer that isn't really a good thing (ie, Rhodes)
But I'm glad I have Takatsu on my team, and even if Koch gets the job back, Takatsu makes a kickass set-up man who'll grab a ton of holds.
Have Takatsu on your team and smile at the save, low whip and era that he will provide!