On May 15, 1967 — Roberto Clemente clubs three homers to all fields plus a double off the scoreboard in left-center, driving in all seven Pittsburgh runs in the process. All this, alas, in a losing cause as all of Clemente’s contributions can’t quite keep pace with the Pirate pitchers’ even more generous contributions to their opponents’ final tally. After Bob Veale, Pete Mikkelsen and Juan Pizarro combine to give back every one of those seven runs, the 12-time Gold Glover comes up big in the 9th, scaling the right-field fence to prevent a walk-off homer from Reds reliever Gerry Arrigo, against whom Clemente himself has just gone deep. These heroics, however, only prolong the agony: before he can get one more crack at Arrigo, Clemente will watch Tony Perez’s shot to right center carry far beyond his outstretched glove, carrying with it any hope of a Pirate win, as Pete Rose scores easily from first, giving Cincinnati the 10-inning, 8 – 7 decision.

Source:
Baseball Reference May 15