Of course, this means that someone will have to move out of the rotation to make room for Baker. Glen Perkins was initially called up as a temporary fill-in while Baker rehabbed, but with the way he's pitching, there's no way he's going anywhere. After earning his second win in the Twins' 6-1 victory over the Tigers on Sunday, Perkins now sports a 2.77 ERA in four starts. He has issued only four walks over 26 innings, which may be the most impressive aspect of his stint with the Twins considering his history. Perkins strikes me as a guy who perhaps dials up his performance based on the level of competition; his numbers in the high minors were never overwhelming, but he holds a 2.83 ERA over 60 1/3 big-league innings. As long as he can remain focused and aggressive, I see no reason why he can't continue to be successful with the Twins.
With Perkins performing well and Livan Hernandez and Nick Blackburn holding their own, Boof Bonser looks like the odd man out. Bonser has gotten poor results in the month of May, and while I don't necessarily think a string of four bad starts warrants a demotion (particularly when the peripheral numbers suggest that Bonser hasn't even pitched all that poorly for the most part), I would have no qualms with seeing him moved out of the rotation at this point since the Twins need Baker and everyone else has earned the right to stay.
Bonser is out of options, so he won't be heading to Rochester. The most likely scenario is that he moves to the bullpen when Baker returns. Pitching in shorter stints might help Bonser rebuild his confidence, although considering the first-inning struggles he has experienced at times this season, it could be that he needs to get into a groove, in which case pitching in relief may not be the best thing for him. Either way, it seems inevitable. Even though Joe Christensen wrote yesterday that Bonser's start against the Yankees on Friday "might be his last chance to keep his rotation spot," I believe the writing is already on the wall. Unless something changes dramatically over the course of the next week, I think we'll see Bonser in the bullpen quite soon. And as much as I've defended Bonser, I don't necessarily think that's the wrong choice at this point in time.