The Most Iconic Postseason HR of All-Time: Bill Mazeroski. October 13, 1960. The ONLY Game 7 walkoff HR in World Series history lifted the underdog Pittsburgh Pirates over the stunned New York Yankees. In the Yankees clubhouse after the game, Mickey Mantle wept openly. #billmazeroski #letsgobucs #1960worldseries #pittsburghpirates #newyorkyankees #mickeymantle #iconicbaseball #walkoff #whodoyoucollect #thehobby @pittsburghpirates @baseballhall @iconic_al_