Barry Zito is on the disabled list for the first time in his 12-year career. With Zito on crutches and his sprained right foot immobilized in a boot, the Giants purchased Ryan Vogelsong's contract from Triple-A Fresno. Vogelsong is tentatively scheduled to take Zito's place in the rotation Friday, but his turn could be skipped if he's needed in relief during the series at Coors Field that begins Monday. An MRI exam confirmed Zito has a midfoot sprain, a rare and fluke injury that normally afflicts football players and ballet dancers. Zito hurt himself while pushing off to catch a popped-up bunt attempt in the second inning Saturday.