NEW YORK -- San Francisco Giants catcher Buster Posey was removed from Tuesday night's game with right knee discomfort.

Posey was visited by manager Gabe Kapler and a trainer during the fourth inning against the Mets at Citi Field. Posey was replaced by backup Curt Casali an inning later with San Francisco ahead 7-0.

Posey, 34, has had a resurgent season for the major league-leading Giants. The 2012 NL MVP singled and scored in the top of the fourth inning to raise his batting average to .314 with 39 RBIs and a .925 OPS.