Twins catcher Joe Mauer is likely to miss the rest of the season after being diagnosed with a mild case of pneumonia. Mauer received the diagnosis at the Mayo Clinic on Thursday and doctors recommended medication and two weeks' rest. The Twins have 14 games remaining before the season ends on Sept. 28. "He's really, really not happy about the situation," manager Ron Gardenhire said before Friday's game against the Indians. "He wants to be out there. He wants to be here with the guys, so he's pretty upset."