Baker was scheduled to start the day game of a doubleheader on Monday against the Indians. But manager Ron Gardenhire said after a 4-3 win over the Royals on Sunday that Baker still wasn't feeling right. So the team placed him on the disabled list rather than risk a long-term injury.
The Twins selected the contract of left-hander Scott Diamond from Triple-A Rochester. Diamond will start the night game on Monday, with Anthony Swarzak moved up to pitch the day game.