Roy Oswalt (hamstring) could make a rehab appearance this weekend. Oswalt threw another successful simulated game Tuesday, going four innings and throwing close to 60 pitches. If he doesn't make a rehab start this weekend, he'll throw a simulated game. Either way, he's close to rejoining the Rockies' rotation. "I'm trying to get back and pitch this year and go from there," Oswalt said. "I'm hoping to come back and start at least four, maybe five games."