After hitting 2 home runs off Don Drysdale—the second and deciding one coming four pitches after being decked by Drysdale, presumably in response to the first—and driving in all 4 runs in a 4-1 Pirate win, as quoted in "Clemente's Bat Dumps Bums" https://news.google.com/newspapers?id=CYNPAAAAIBAJ&sjid=cSQEAAAAIBAJ&pg=5013%2C4959243 by Joe Carnicelli (UPI), in The Hendersonville Times-News (Monday, June 5, 1967); p. 9
Baseball-related, <big><big>1960s</big></big>, <big>1967</big>
“I only have one superstition: I make sure to touch all the bases when I hit a home run.”
As quoted in Baseball's Greatest Quotes (1982) by Kevin Nelson; reproduced in "Morning Briefing: Babe Ruth Was Not a Superstitious Man, Except on 714 Occasions," in The Los Angeles Times (March 1, 1982), p. D2
Unsourced variants:
Just one.Whenever I hit a home run, I make certain I touch all four bases.
I have only one superstition. I touch all the bases when I hit a home run.
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Babe Ruth 70
American baseball player 1895–1948Related quotes
Speaking before Game 7 of the 1971 World Series, as quoted in "Numero Uno: Roberto!" http://www.mediafire.com/view/1vobx891junlic4/.JPG (1973) by Bill Christine, p. 141
Baseball-related, <big><big>1970s</big></big>
On his chances for a third consecutive NL batting title; as quoted and paraphrased in "Clemente Not Thinking of Batting Title" by Milton Richman, in The Cumberland Evening Times (Tuesday, March 15, 1966), p. 12
Baseball-related, <big><big>1960s</big></big>, <big>1966</big>
Context: “I never think about that before the season. Toward the end of the year I start thinking about it. Not before. I did it last year by just meeting the ball,” he said. “I didn’t swing hard at all. I think I’m going to do the same thing this year. We have two good hitters behind me now and I don’t have to swing so hard.” He means Donn Clendenon and Willie Stargell. The two hit a total of 41 homers to Clemente’s 10 last year. “They always say we need someone to hit home runs. We got some guys who can now. I don’t care for home runs. I showed ’em I could do it when I hit 23 in 1961. Home runs aren’t that important, though. Not to me, anyway.”
Speaking with Nellie King in 1967 or later; as quoted by King in "Frustration in the Fifties" https://books.google.com/books?id=03XsO25A3I8C&pg=PA60&dq=%22As+Nellie+King+recalls,+Clemente+occasionally%22&hl=en&sa=X&ved=0ahUKEwi63oCQjcfNAhWEOyYKHUvbBrMQ6AEIFDAA#v=onepage&q&f=false, from Roberto Clemente: The Great One (1998) by Bruce Markusen, pp. 60-61
Baseball-related, <big><big>1960s</big></big>, <big>1967</big>
As quoted in "Bob Says 'They Try': Feeble Pitching Takes Joy From Clemente's Night" https://news.google.com/newspapers?id=hBFOAAAAIBAJ&sjid=h_0DAAAAIBAJ&pg=5612%2C2872741 by Charley Feeney, in The Pittsburgh Post-Gazette (Wednesday, May 17, 1967), p. 26
Baseball-related, <big><big>1960s</big></big>, <big>1967</big>
As paraphrased and quoted in "Clemente Back, Lashes Out at Writers; Buc Explodes Over 'Team Player' Image" https://news.google.com/newspapers?id=LJxRAAAAIBAJ&sjid=02wDAAAAIBAJ&pg=7083%2C4907609
Baseball-related, <big><big>1960s</big></big>, <big>1969</big>
Context: The 100 grand right fielder revealed that Danny Murtaugh once fined him $650 when he did not run after hitting a ball to the shortstop. He never explained how Murtaugh reached the $650 figure. "I hit the ball and I slip at home plate and they fine me $650. First time up I hit a homer one-handed. I just limped around the bases."
As quoted in “Clouter Clemente: Popular Buc; Rifle-Armed Flyhawk Aims At Second Bat Crown” by Les Biederman, in The Sporting News (September 5, 1964)
Baseball-related, <big><big>1960s</big></big>
As quoted in "The Great Outdoors: Drafted for $4,000, Clemente Becomes Bucs' Top Bargain; Now That His Back Ailment Is Cured, Outfielder Hopes He'll Hit .300 Again" https://news.google.com/newspapers?id=xUEqAAAAIBAJ&sjid=Dk4EAAAAIBAJ&pg=7140%2C2566447 by Les Biederman, in The Pittsburgh Press (Thursday, April 10, 1958), p. 28
Baseball-related, <big><big>1950s</big></big>, <big>1958</big>
As quoted by Les Biederman—who, not coincidentally, notes both Clemente's successful suppression of "the home run urge" and his ability to "hit for distance with the best" (the former earning the "unqualified praise of George Sisler")—in The Sporting News (June 1, 1960), p. 7
Baseball-related, <big><big>1960s</big></big>, <big>1960</big>
Source: I Had a Hammer : The Hank Aaron Story (1990), Ch. 1