Add Yahoo as a preferred source to see more of our stories on Google. FILE - Sweden's Björn Borg falls to his knees in front of the scoreboard on the Centre Court at Wimbledon in London, July 5, 1980, ...

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It is not so unusual for superstars to quit their sport, though they are normally drawn back in soon enough. Michael Jordan left the NBA at the peak of his powers and returned two years later after an ...