CINCINNATI -- Reds left-handed reliever Sean Marshall, who has been on the 15-day disabled list since April 10 (retroactive to April 8) because of tendinitis in his left shoulder, pitched on a rehab assignment Monday night for Triple-A Louisville.
He pitched a 1-2-3 inning, striking out two, and threw eight of his 12 pitches for strikes.
Marshall is eligible to be activated on Tuesday, but Reds manager Dusty Baker indicated that it might take longer.
"There could be some more [rehab games]," Baker said. "Usually one is not enough. You've got to do a day in between, then usually a back-to-back. We'll see how he comes out of this.
"Just the fact that he went out is a positive sign."
Mark Sheldon is a reporter for MLB.com. Read his blog, Mark My Word, and follow him on Twitter @m_sheldon This story was not subject to the approval of Major League Baseball or its clubs.