Chicago Cubs pitcher Ryan Dempster, who has not allowed a run in his last 22 innings, was placed on the 15-day disabled list on Monday with tightness in his right lat.
Dempster, who is 3-3 with a 2.11 ERA, has been the subject of trade rumors, but he has pitched well lately. He had gone 18 consecutive starts without a win, but has won his past three games.
Randy Wells (1-1, 4.50 ERA) will make the start on Wednesday in place of Dempster.
Left-hander Scott Maine was recalled from Triple-A Iowa to take Dempster's spot on the roster.