No reason has been given for the switch. The Orioles said they will provide more information later this afternoon.
Bundy is 13-9 with a 4.24 ERA in 28 starts over 169 2/3 innings. He would have been working on an extra day of rest.
Manager Buck Showalter chose Bundy after the right-hander had a good work day. They met yesterday in Showalter’s office before batting practice.
Tillman is 1-7 with a 7.66 ERA in 22 games, including 18 starts, his only win coming in his debut on May 7 against the White Sox. His most recent start came against the Blue Jays on Sept. 3, when he allowed three runs over four innings.
Tillman has made two relief appearances since the start, the most recent covering three innings on Sept. 16 at Yankee Stadium. He threw 56 pitches while allowing one run.
Shortstop Tim Beckham isn’t available today due to a hamstring injury sustained in the ninth inning of last night’s 9-6 loss to the Rays. He will receive treatment on Monday while the team is off.