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10/02/12 10:15 PM ET

Nady shows he's still got zip left on his throws

LOS ANGELES -- For a guy who has undergone Tommy John elbow surgery twice, left fielder Xavier Nady still can throw proficiently.

Nady proved that in Monday night's sixth inning by making a strong one-hop throw home to retire Adrian Gonzalez, who was trying to score on Shane Victorino's single to left field.

Though Nady endured his procedures years ago, in 2001 and 2009, he indicated that the effects of the twin surgeries linger to some degree.

"Some days feel better than others," Nady said Tuesday. "I'm thankful I can still throw and play defensively."

Nady modestly said that Dodger Stadium's close-cropped infield helped his throw skip toward home plate a little more quickly.

"I give the grass credit," Nady said. "That's a fast infield. I was just trying to get it to the cutoff man and make a decent throw."

Back spasms no concern as Posey starts at first

LOS ANGELES -- Never concerned about the mild back spasms that forced his removal from Monday's game in the eighth inning, Buster Posey started at first base for the Giants on Tuesday night against the Dodgers.

"It felt like a crick in my neck, except it was in the upper back," Posey said.

Just to be sure about Posey's health, manager Bruce Bochy monitored the All-Star catcher during batting practice. Had Posey felt merely a twinge, Bochy would have scratched him from the lineup.

Had Posey avoided back woes entirely, he might have engaged in the rare activity of catching Barry Zito, Bochy said. Posey has formed the starting battery with Zito in seven of the left-hander's starts, compared with 25 for Hector Sanchez. Bochy reiterated that he won't hesitate to pair Posey with Zito in the postseason.

Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.