Though he admitted to having some rust, Roy Halladay was happy with the way he felt in Thursday night's minor-league rehabilitation start and he hopes to return to the Phillies' rotation on Tuesday. "I felt good," Halladay said before the Phils played the Colorado Rockies on Friday night. "Location-wise, there were some mistakes at times, but I felt good. "The biggest problem I was having before [going on the disabled list] was getting up and down between innings. I'd feel like I was laboring. But I didn't feel that yesterday. I felt like I stayed loose the whole time. It was obviously pain-free and I felt free and easy." Halladay will throw a bullpen session Saturday. If all goes well, he could pitch in Los Angeles on Tuesday night. "We'll see how he feels," GM Ruben Amaro said. "It's really a day-to-day thing." Manager Charlie Manuel said the plan was for Halladay to pitch Tuesday, provided his bullpen session goes well. Halladay was placed on the disabled list May 28 with what at the time was called a strained lat muscle behind his right shoulder. The 35-year-old pitcher indicated Friday that his problems were more than a lat strain and they started in spring training when he had trouble getting his shoulder loose. "Honestly, we had one [doctor] say there was some rotator cuff changes and one said there were lat things," he said. "I'm sure that was stuff that was in there. But I think the tightness, to me, that was probably the big factor. Whether that led to some of those things showing up, I don't know. But once we calmed all that down and started working on it, I noticed a big difference."