Less than 24 hours after hitting his first two major league home runs, Atlanta rookie Earl Williams becomes the first player ever to reach the upper deck at Veterans Stadium, depositing a 2-and-1 offering from Philly starter Rick Wise “in the first row of the orange seats (middle section) of the upper deck,” tucked just inside the left-field foul pole. The 4th-inning, bases-empty blast ties the game at 2, combining with a red-hot Orlando Cepeda, who goes 5-for-5 with a double, home run and 3 RBI, to lead Atlanta to a third straight win and a series sweep over the lowly Phils.

On April 18, 1971 — Less than 24 hours after hitting his first two major league home runs, Atlanta rookie Earl Williams becomes the first player ever to reach the upper deck at Veterans Stadium, depositing a 2-and-1 offering from Philly starter Rick Wise “in the first row of the orange seats (middle section) of the upper deck,” tucked just inside the left-field foul pole. The 4th-inning, bases-empty blast ties the game at 2, combining with a red-hot Orlando Cepeda, who goes 5-for-5 with a double, home run and 3 RBI, to lead Atlanta to a third straight win and a series sweep over the lowly Phils.

Source
Baseball Reference April 18