McEnroe not counting out Federer after surgery; Clijsters loses in Mexico

McEnroe not counting out Federer after  surgery;  Clijsters loses in Mexico
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Roger Federer has spent more weeks ranked No. 1 than any player and owns a men’s record 20 Grand Slam titles. He currently is ranked No. 4 behind Novak Djokovic, Rafael Nadal and Dominic Thiem.