The 31-year-old center fielder from Santa Fe High School had back surgery Thursday in Los Angeles and likely will be sidelined for three months. Dr. Robert Watkins termed the procedure to repair a herniated disk successful. “We’ll have to deal with it,” said Bradley, who becomes Oakland’s starting center fielder. “I know he agonized over it the past couple of years. It’s good he’s taking care of it so he doesn’t have to go out and play in pain.” Thomas is scheduled to be a designated hitter in today’s `A’ game against the Houston Astros. 160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! PHOENIX – Milton Bradley felt like he had a kindred spirit in Mark Kotsay. The two Oakland outfielders are next-door neighbors in the Athletics’ clubhouse and are close in other ways, too. “I look in his eyes and I see the same fire I have in my eyes,” Bradley said. “It’s tough not seeing him in there and not playing with on an every day basis.” Kotsay first injured his back running into the outfield wall while with the San Diego Padres in 2003. Kotsay started 96 of the A’s first 111 games through Aug. 6 last year, but the back problem limited him to 25 starts over the final 51 regular-season games. KISSIMMEE, Fla. – Mike Hampton’s comeback took a major blow when the Atlanta Braves pitcher injured his left side during batting practice. He won’t be ready for the start of the regular season. Hampton, starting the seventh season of an eight-year $121 million contract, fell to the ground in pain after a swing, prompting fears that he broke a rib. X-rays were negative and team doctors determined that he strained his left oblique, still a serious injury for a pitcher. DUNEDIN, Fla. – Frank Thomas made his first appearance for the Toronto Blue Jays and went 1 for 3 with an RBI Thursday in a “B” game against Philadelphia.