The Giants reinstated infielder Mark DeRosa from the 60-day DL before Thursday night's series opener against the Phillies, according to an ESPN.com report. DeRosa, hampered by a left wrist strain, has been limited to 18 games this season. He is hitting .162 with no homers and three RBIs. He is a career .271 hitter with 93 home runs. Brandon Belt was optioned to Triple-A Fresno to make room for DeRosa on the roster.