On August 9, 1971 — Despite belting six home runs – three by Bill Freehan, two by Willie Horton, one by Aurelio Rodriguez – at Fenway Park, the Tigers lose to the Red Sox, 12 – 11. The Sox have only one homer, a grand slam by Bob Montgomery. Rico Petrocelli’s pinch single with two outs in the 9th drives home the winner.

Source:
Baseball Reference August 9
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game