Tommy John surgery bad, although the Twins say he's going to rest for two to three weeks first.
The verdict is a "significant tear" in the ulnar collateral ligament. I have a difficult time imagining that he's going to pitch this year, but the man's 35, and his clock's ticking. It sounds like he wants to try to pitch with it.
Ron Gardenhire said earlier that he wasn't going to worry about replacing Nathan until he had to. Now, he's got that to worry about.