Roy Halladay could start for the Phillies in Sunday's series finale against the Diamondbacks. Halladay was scheduled to make a minor league rehab start with Double-A Reading on Sunday, but with Sunday's expected starter Tyler Cloyd forced into action in Saturday's game, the Phillies will need someone to fill-in. He struggled in his first rehab start at Low-A Lakewood on Tuesday, but they may not have another option.