For the second time in 10 days, Dave Roberts of the Padres and Tom Seaver of the Mets lock up in a pitchers duel, but this time, Seaver comes out on top, 2 – 1. Ed Spiezio hits a solo homer for San Diego in the 3rd, then Cleon Jones triples and comes in to tie the score on a sacrifice fly for the Mets in the 7th. Jones then ends the game with a walk-off home run with two outs on the bottom of the 9th, only the third hit allowed by Roberts. Seaver and Roberts will finish first and second respectively in the National League ERA race.

This Day In Baseball

On August 21, 1971 — For the second time in 10 days, Dave Roberts of the Padres and Tom Seaver of the Mets lock up in a pitchers duel, but this time, Seaver comes out on top, 2 – 1. Ed Spiezio hits a solo homer for San Diego in the 3rd, then Cleon Jones triples and comes in to tie the score on a sacrifice fly for the Mets in the 7th. Jones then ends the game with a walk-off home run with two outs on the bottom of the 9th, only the third hit allowed by Roberts. Seaver and Roberts will finish first and second respectively in the National League ERA race.

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Sources:
Baseball Reference August 21
National Pastime August 20
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game