Phillies GM Ruben Amaro thinks Roy Oswalt (back) might need more than one rehab start. Oswalt looked terrific during a bullpen session Friday and thinks he needs just one rehab outing, which Amaro referred to as "optimistic." The GM added, "Clearly, he seems to be passed some of the back issues he's been having, so that's a great thing," Amaro said. "[One rehab start] is optimistic. I don't know if it's realistic. But he knows his body better than anybody else... We've got to be cautious with him. We still need him for the long haul." Phillies starters have a 3.18 ERA in 21 games since Oswalt's last start, so there's no need to rush him back.