NEW YORK -- Outfielder Corey Brown underwent surgery on Wednesday because of a staph infection in his right knee, and he is out for the season.
Manager Davey Johnson learned about Brown's problem on Sunday, when the Nationals were preparing to depart for New York. Team doctors then suggested to Johnson that Brown would be better off if he didn't travel.
Brown went hitless in three at-bats after his promotion to the big leagues last Tuesday.
Brown was part of the deal that sent Josh Willingham to the Athletics in December.