CINCINNATI -- Brewers right-hander Shaun Marcum cut short a throwing session Monday because of lingering discomfort in his right elbow, a development that could extend what was supposed to be only a brief stay on the 15-day disabled list.
The Brewers had hoped to have Marcum back on the mound either Saturday or Sunday against the D-backs, after two missed starts. But that plan is now in doubt after Marcum played catch with head athletic trainer Dan Wright in the outfield grass at Great American Ball Park in his first activity since a June 14 start at Kansas City, when he felt tightness in his surgically-repaired elbow.
Marcum told a reporter he was "still sore."
"I'm a little discouraged, too," manager Ron Roenicke said. "We have to do it day by day. If everything goes well, we'll try to come out and throw again [Tuesday], and keep doing it."
Marcum said he'd undergone a series of tests after the start against the Royals, including an MRI scan, that showed no abnormalities. He underwent Tommy John surgery in 2008.
As long as Marcum is sidelined, the Brewers will continue to rely on rookie right-hander Mike Fiers, who has a 2.70 ERA in five starts and one relief appearance. He scattered five hits in 7 1/3 scoreless innings against the White Sox on Sunday.
"Any time somebody comes out and pitches like that, it opens up some eyes," Roenicke said.