CHICAGO -- Manager Bruce Bochy named Barry Zito as the probable starting pitcher for Saturday's game at Detroit, though the left-hander will be working on three days' rest, one fewer than usual. Zito looked sharp against the Chicago Cubs on Tuesday night in his first Major League outing since spraining his right foot in mid-April. He threw 108 pitches while limiting Chicago to two runs and four hits in seven innings in the evening portion of a day-night doubleheader at Wrigley Field. Ryan Vogelsong, who pitched the afternoon game, was less effective than Zito, needing 107 pitches to last five innings while surrendering six runs (three earned) and six hits. Bochy explained that his preference to keep his options open prevented him from finalizing the Zito decision. If Zito pitches Saturday, Vogelsong will start Sunday's series finale on his regular four days' rest. That would set up Tim Lincecum to pitch Monday's July 4 series opener against the San Diego Padres at AT&T Park.