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The gulf between the haves and the have-nots of men's tennis has never been vaster.

Sure, Tomas Berdych took a set off Rafael Nadal in their quarterfinal match -- but he's ranked No. 7 among ATP World Tour players. At the same time, Juan Martin del Potro, the No. 11 player, got skunked by Roger Federer, a man he beat two years ago for his only Grand Slam singles title.

Federer and Nadal will meet Thursday for the 27th time in their spectacular rivalry, quite possibly the best in tennis history. On Wednesday, the other two members of the big four -- Novak Djokovic and Andy Murray -- booked their passage for an Australian Open semifinal.

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Related Topics: tennis, Australian Open