On August 4, 1961 — At Candlestick Park, Warren Spahn wins his 299th game, 2 – 1, over the Giants. He gets a bit of help from Hank Aaron who leads off the 7th and 9th with homers off Mike McCormick. The Giants only score is an Orlando Cepeda homer in the 5th.
Source:
Baseball Reference August 4
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game