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What happened last year?

In his first full year in the league, Brayan Villarreal proved to be a useful player in the Tigers' bullpen. He threw 54 2/3 innings, striking out batters at a rate of 10.9 per nine innings. There were some reasons to worry: His walk rate of 4.6 per nine innings was a bit higher than you'd prefer. But as he works out of the bullpen, it doesn't seem like that big a deal. With a 2.63 ERA, he seemed to fare pretty well.

However, one area of concern is that ERA doesn't tell the entire story. Villarreal allowed 11 inherited runners to score. That was the second-most on the team (one behind Phil Coke, who inherited 18 more baserunners.) Among pitchers who regularly came into the game with runners on base, Villarreal was the worst in the bullpen.