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Roscoe Tanner was on Johnny Carson talking about Borg, and Tanner said he went into a match with Borg thinking, well, I can groundstroke as well as he can. I'll give up my serve-and-valley and just outwait him.
According to Tanner, the first point goes 40-some strokes back and forth :- ) and ... dramatic pause ... "I'm getting TIRED out there!" ... and figured out why nobody tried to do that against Borg.
Wonder whether tennis players or soccer players have better wind.