Jose Valverde impressed a lot of people last year by going a perfect 49-49 in save opportunities. Valverde is not a great pitcher. He's misses bats, but he also misses the strike zone. His shiny 2.24 ERA belied mediocre peripherals.
In any event, he got the 2012 season off to a start by promptly blowing his first save chance. He came in the the game in the top of the 9th; the Tigers had a 92% chance of beating the Red Sox. He gave up 2 runs before gettting out of the inning, lowering their chances of winning to 65%. Have no fear. The Tigers scored a run in the bottom of the 9th, giving Valverde the "win".
For a performance that had the effect of a 1/4 game loss, he gets a "win". Yep.