A's pitcher Drew Pomeranz breaks hand punching wooden chair after rough start

Drew Pomeranz had been another of those diamonds in the rough the Oakland Athletics bring in, shine up and let the rest of us marvel at.

Going into his Monday night start against the Texas Rangers, Pomeranz had a 1.90 ERA through 17 appearances, eight as a starter. He joined the A's in December, Oakland's return in the Brett Anderson trade. Pomeranz, a first-round pick in 2010, was showing signs of that first-round talent since being added to the rotation in May.

Then, Monday night, things went really wrong. Pomeranz gave up seven earned runs in 3 2/3 innings in Oakland's 14-8 loss, making his ERA jump up to 2.91. That's not the worst part, though. Pomeranz fractured his hand in a fit of rage afterward.

The good news? It wasn't his pitching hand. The bad news? He's going on the disabled list and the timetable for his return is uncertain. He'll be able to throw at least. Pomeranz joins Logan Morrison as MLB's rageaholics of the week.

Meanwhile, looking to bolster their pitching ranks, the A's acquired Brad Mills in a trade with the Milwaukee Brewers earlier in the day. It sounds like there's a good chance Mills will start in Pomeranz' place in the rotation. He's posted a 1.56 ERA in Triple-A this season, which sounds promising, if not for the 7.76 ERA over 10 MLB starts in four seasons. But, hey, these are the A's. Maybe they'll find treasure again.

As for Pomeranz, now he knows why a big-league clubhouse has something like this:

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Mike Oz is an editor for Big League Stew on Yahoo Sports. Have a tip? Email him at mikeozstew@yahoo.com or follow him on Twitter!

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