Roberto Clemente’s 4th and 5th (out of 6) career home runs off his friend and fellow future Hall of Famer Ferguson Jenkins provide the Pirates with a sudden and devastating 4 – 3 walk-off win, against the Cubs at Three Rivers Stadium. Clemente hits Fergie’s first pitch in the 7th inning over the left field fence to tie the game. After the Bucs fall behind, 3 – 2, his second homer is a game-ending blast with none out in the 9th.

On july 1, 1972 Roberto Clemente’s 4th and 5th (out of 6) career home runs off his friend and fellow future Hall of Famer Ferguson Jenkins provide the Pirates with a sudden and devastating 4 – 3 walk-off win, against the Cubs at Three Rivers Stadium. Clemente hits Fergie’s first pitch in the 7th inning over the left field fence to tie the game. After the Bucs fall behind, 3 – 2, his second homer is a game-ending blast with none out in the 9th.

Source
Baseball Reference July 1