“He insisted the other players allow me to take batting practice and he helped me. He put a bat behind my foot and made sure I didn't drag my foot. Willie Mays also helped me. He told me not to allow the pitchers to show me up. He suggested I get mean and if the pitchers knocked me down, get up and hit the ball. Show them.”
As paraphrased and quoted in "The Scoreboard: Clemente's Only Regret? One Pennant" by Les Biederman, in The Pittsburgh Press (Sunday, March 31, 1968), Sec. 4, Pg. 3
Baseball-related, <big><big>1960s</big></big>, <big>1968</big>
Context: The best advice and most help he ever received came from Buster Clarkson, an American player, when he was in Puerto Rico."I played for his team and I was just a kid," Clemente recalled. "He insisted the other players allow me to take batting practice and he helped me. He put a bat behind my foot and made sure I didn't drag my foot. Willie Mays also helped me. He told me not to allow the pitchers to show me up. He suggested I get mean and if the pitchers knocked me down, get up and hit the ball. Show them."
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Roberto Clemente 170
Puerto Rican baseball player 1934–1972Related quotes

As quoted in "The Scorebaord: Pride Drives Clemente" https://news.google.com/newspapers?id=Z0sqAAAAIBAJ&sjid=pk8EAAAAIBAJ&pg=5301,452323 by Les Biederman, in The Pittsburgh Press (Wednesday, November 16, 1966), p. 87
Baseball-related, <big><big>1960s</big></big>, <big>1966</big>

As quoted in "Clemente Voted Most Valuable In National League" https://news.google.com/newspapers?id=kRQhAAAAIBAJ&sjid=GIwEAAAAIBAJ&pg=7374%2C2380506&dq=beginning-sea-son-told-wanted by the Associated Press, in The Sarasota Journal (Wednesday, November 16, 1966), p. 20
Baseball-related, <big><big>1960s</big></big>, <big>1966</big>

As quoted in "The Sportlight: Learning From Others" by Grantland Rice, in The New York Tribune (March 15, 1923), p. 14

From I Had a Hammer (1990) by Aaron, with Lonnie Wheeler; as reproduced in Hank Aaron https://books.google.com/books?id=tcPC-qgM8McC&pg=PA48&lpg=PA48&dq=%22Guessing+what+the+pitcher+is+going+to+throw+is+80+percent+of+being+a+successful+hitter.+The+other+20+percent+is+just+execution.%22&source=bl&ots=QZ81enT7WV&sig=NL9G0fGgcTJGfc6oVOYvuzBV2sI&hl=en&sa=X&ved=0ahUKEwjQu9DFxcjVAhUEwYMKHdamDmsQ6AEIOzAE#v=onepage&q=%22Guessing%20what%20the%20pitcher%20is%20going%20to%20throw%20is%2080%20percent%20of%20being%20a%20successful%20hitter.%20The%20other%2020%20percent%20is%20just%20execution.%22&f=false (2007) by Jamie Poolos, p. 48

Anything Like Me, written by Brad Paisley, Chris DuBois, and Dave Turnbull.
Song lyrics, American Saturday Night (2009)

As quoted in "The Scoreboard: Hitting in Daylight" (.411 Vs. .302) Best For Clemente; Roberto 'Feels Good' In Sunshine; Chicago's Wrigley Field His Favorite; Clemente Can Hit to All Field; Pirates Paid Only $4,000 For Him" https://news.google.com/newspapers?id=YGscAAAAIBAJ&sjid=t04EAAAAIBAJ&pg=4128%2C3280138 by Les Biederman, in The Pittsburgh Press (Sunday, March 11, 1962), Sec. 4. p. 3
Baseball-related, <big><big>1960s</big></big>, <big>1962</big>