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American tennis player John McEnroe in action against fellow American Jimmy Connors in the semifinals of the Men's singles tournament at the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis Club in Wimbledon, London on 30th June 1977. Jimmy Connors would go on to win the match 6-3, 6-3, 4-6, 6-4. (Photo by Popperfoto via Getty Images/Getty Images)

American tennis player John McEnroe in action against fellow American Jimmy Connors in the semifinals of the Men's singles tournament at the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis Club in Wimbledon, London on 30th June 1977. Jimmy Connors would go on to win the match 6-3, 6-3, 4-6, 6-4.  (Photo by Popperfoto via Getty Images/Getty Images)