Wei-Yin Chen (oblique) allowed four runs on five hits and two walks while striking out five over five innings in a rehab start with Double-A Bowie Saturday. Chen threw 79 pitches, sitting at 91 mph and touching 93 mph with his fastball. The left-hander declared himself ready to go after the outing. "After six weeks of rest, I'm pretty confident I'm really good right now," Chen said. "I'm real satisfied with tonight's game and real satisfied with the performance tonight. I tried to work hard and work every pitch and try to get everything out." Orioles manager Buck Showalter indicated that Chen will likely rejoin the rotation either Thursday or Friday.