As paraphrased and quoted in "The Scoreboard: Big Day For Two Pirates; Stargell Started Streak Against Roberts; Clemente's Friend Retrieves Ball; Longest Drive In Wrigley Field" https://news.google.com/newspapers?id=z3wqAAAAIBAJ&sjid=Tk8EAAAAIBAJ&pg=6610%2C2693224 by Les Biederman, in The Pittsburgh Press (Monday, June 6, 1966), p. 36.
Baseball-related, <big><big>1960s</big></big>, <big>1966</big>
Context: [Clemente] goes back to the ball he hit in Wrigley Field, Chicago. He rates this one No. 1 for distance, perhaps 600 feet. Clemente, himself, paced off the distance from the centerfield wall to the scoreboard right above and when he was shown the spot where the ball landed, he knew this was No. 1. "I hit one off Sam Jones one night over the left-center fence at Candlestick Park and that was a good one," he said. "And two I remember off Sandy Koufax. One over the right field fence at the Coliseum, the other here at Forbes Field. This one hit a transformer on the left-field light tower on the way up and it stopped. No telling how far it might have gone. And you remember I came within a few inches of putting one on the right field roof here.".
