Agee batted .357 with two home runs and four RBIs in the Mets' three-game sweep of the Atlanta Braves in the 1969 National League Championship Series. The Mets were heavy underdogs heading into the World Series against the Baltimore Orioles. In Game 3 (the first World Series home game in Mets history), with the series tied 1–1, Agee had what "Sports Illustrated" called the greatest single performance by a center fielder in World Series history. In the first inning, Agee hit a leadoff home run off Jim Palmer for what would eventually be the game-winning hit and RBI, as the Mets shut out the Orioles, 5–0. In the same game, Agee also made two catches that potentially saved five runs. The first catch came in the fourth inning with Gary Gentry pitching and two outs and runners on first and third. Agee, playing the left-handed hitting Elrod Hendricks to pull, made a backhanded catch near the base of the wall in left centerfield. The second catch came in the seventh inning with Nolan Ryan relieving Gentry; the bases were loaded with two outs, and Agee made a headfirst dive in right centerfield on a ball hit by Paul Blair.