Djokovic, Federer face tough tests to making finals
 

Djokovic, Federer face tough tests to making finals
NEW YORK (Reuters) - **vak Djokovic and Roger Federer remain on course for a marquee one-two clash in the men's U.S. Open final, but each must first vanquish a formidable opponent and friend in Friday's semi-finals at Flushing Meadows.
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