Washington Nationals third baseman Ryan Zimmerman underwent arthroscopic shoulder surgery Thursday.
Zimmerman received cortisone shots during the season and played through the pain, CSNWashington.com reported. His recovery is expected to take six weeks.
The 28-year-old Zimmerman played in 145 regular-season games and hit .282 with 25 home runs and 95 RBI. He batted .381 with two homers and four RBI in the postseason.