50 Moments that Mattered: In the last match of one of the most storied rivalry in tennis history, Pete Sampras defeated longtime friend and foe Andre Agassi in four sets to win his fifth #USOpen championship. Sampras did not play another match for the rest of his career, choosing to go out on top. #USOpen50 #petesampras #andreagassi #agassi #sampras #rivals #legends #flushingmeadows #tennis