SAN FRANCISCO -- Clearing roster room for what could be multiple player moves before Thursday's Trade Deadline, the Giants optioned outfielder Tyler Colvin to Triple-A Fresno after Wednesday's 7-5 victory over the Pittsburgh Pirates.
Sources said that the Giants also were pondering whether to release second baseman Dan Uggla, the three-time All-Star who was 0-for-11 with six strikeouts and three errors in four games as a Giant. But Colvin's demotion was the only move officially announced as the day ended. Colvin had minimal impact in 57 games, batting .223 with two home runs and 18 RBIs. He also was 1-for-14 as a pinch-hitter.
Striving for stability at second base, the Giants were rumored to be pursuing middle infielders such as Cleveland's Asdrubal Cabrera and the Chicago Cubs' Emilio Bonifacio in trade discussions, according to multiple reports.
Either player would represent an upgrade. Giants second basemen entered Wednesday batting .176, tied for last in the National League. They also owned a .257 on-base percentage, ranked next-to-last in that category among NL clubs.
Cabrera, 28, is hitting .246 with nine home runs and 40 RBIs in 97 games. He's currently an everyday shortstop, but he has extensive experience at second base.
Bonifacio is a classic utility man, capable of playing outfield as well as infield -- which could help the Giants if center fielder Angel Pagan's comeback from a back injury stalls. Bonifacio has played for six teams in eight big league seasons, spending most of his time with the Marlins (2009-12). He entered Wednesday hitting .279 with two homers and 18 RBIs in 69 games.
The Giants also need 40-man roster room to accommodate the return of Pagan, first baseman Brandon Belt (concussion) and catcher Hector Sanchez (concussion), all of whom could be activated during the club's three-city, 10-game trip that begins Friday in New York.
Chris Haft is a reporter for MLB.com. Read his blog, Haft-Baked Ideas, and follow him on Twitter at @sfgiantsbeat. This story was not subject to the approval of Major League Baseball or its clubs.