Roy Oswalt struggled in his rehab start for Double-A Tulsa on Friday, surrendering three runs on four hits over his five innings of work. Oswalt walked three and struck out three in the game. He threw 44 of his 72 pitches for strikes in the game, but did serve up a pair of home runs. He's expected to need another three minor league starts before he's ready to join the Rockies rotation. He could be worth a flyer in deeper mixed leagues.