TEMPE, Ariz. -- Giants second baseman Ray Durham was scratched from Thursday's starting lineup with tightness in his left hamstring, although the injury was not considered serious. His playing status is day-to-day.

Durham played all nine innings of Wednesday night's 4-2 exhibition loss to the Chicago Cubs, which likely affected his leg. He reached base safely in all four of his plate appearances, singling, doubling and walking twice.

Durham has enjoyed a successful spring, winning his competition with Kevin Frandsen for the second-base job. The switch-hitting Durham entered Thursday ranked third among National Leaguers and fourth in the Cactus League with a .436 batting average. He also owned a .641 slugging percentage, best among all Giants with at least 15 at-bats.

Durham, 36, has gone on the disabled list twice (2004, 2006) with left hamstring injuries, explaining the Giants' caution. His various ailments have limited him to fewer than 140 games in four of his five seasons with San Francisco.

In other injury-related news, manager Bruce Bochy acknowledged the possibility that infielder Kevin Frandsen (left Achilles tendinitis) and right-hander Vinnie Chulk (shoulder tendinitis) could begin the regular season on the 15-day disabled list. Bochy added that he'll know more after this weekend, since Frandsen was expected to be sidelined for three to four days and Chulk is waiting to see how he'll physically respond to making 40 throws on flat ground Wednesday.

Right-hander Tyler Walker was enduring a touch of food poisoning, yet pitched one inning in Thursday's 8-1 exhibition loss to the Los Angeles Angels. Walker, who entered the game with a 1.23 ERA, yielded Erick Aybar's two-run homer, which Bochy dismissed due to the reliever's illness. "You have to throw that out," Bochy said.