Mauer took batting practice on the field over the weekend, but worked out inside Tuesday and Wednesday. But Wednesday was the first time that Mauer had to shut it down early, according to Twins general manager Terry Ryan.
"He didn't have a good day," Ryan said. "It's a concern more than frustration. You've got to feel for the guy. He just didn't feel good today so we sent him home. This wasn't a good day and I don't want to hide that at all. So he's home and hopefully he comes back tomorrow feeling better and he'll get back on track here."
Rhett Bollinger is a reporter for MLB.com. Read his blog, Bollinger Beat, and follow him on Twitter @RhettBollinger. This story was not subject to the approval of Major League Baseball or its clubs.