Brian Wilson may have the title of best beard, but don't let that distract you from realizing he is the most dominant closer in the game. He has even added a two-seam fastball this year that tails in to right handed hitters, making him even more of harder pitcher to try and guess against.
Craig Kimbrel is unproven as a closer so far, but from what he showed us last year—and the small sample we have seen this season—this guy is very very talented. He has nerves of steel to go along with stuff that is very tough to square up.
Jonathan Broxton is a very interesting pitcher to evaluate. With the kind of heat he is capable of throwing, combined with the complementary secondary pitches, he should be elite. But he isn't because of his inconsistency with control and arm strength. Quite frankly, I question his offseason conditioning and work out program.
Leo Nunez normally wouldn't be a guy that a fantasy owner would target, but with the recent hot streak of the Marlins, the bullseye is growing for his services. If he continues to get opportunities to close out games, he could rack up close to 40 saves.
Sergio Santos is not the official closer yet, but he is very close. When he does take control of the ninth, look out, because this guy has some lights-out stuff. He has yet to give up an earned run this year and is striking out people at an absurd rate. Get him. Now!