Dr. Bill Meyers, the specialist who diagnosed the tear Friday and performed the surgery today, “was pleased with the procedure and is optimistic that Ryan will be back playing at full strength soon,” said Brodie Van Wagenen of CAA Sports, Zimmerman’s agent.

The Nationals expect a six-week recovery time, General Manager Mike Rizzo said Saturday. The Nationals, who begin a nine-game road trip against three National League East contenders in Philadelphia today, have gone 11-9 without their best player.

Zimmerman is confident he and the Nationals took the proper approach to treating the injury. He played with a strain until April 9, when he slid into second base against the New York Mets and the strain turned into a tear. Zimmerman tried to rehab the injury, seeing surgery as a last resort, but decided on visiting a specialist after a clear dearth of progress.

Zimmerman will start the recovery process, Nationals athletic trainer Lee Kuntz said Saturday, by walking one mile tomorrow.