Roger Federer rallies, reaches semis
LONDON -- Six-time champion Roger Federer rallied past Juan Martin del Potro 4-6, 7-6 (2), 7-5 Saturday, setting up a semifinal against Rafael Nadal at the ATP World Tour Finals.
Novak Djokovic will take on Stanislas Wawrinka in the other semifinal Sunday at the year-end tournament. Djokovic beat Richard Gasquet 7-6 (6), 4-6, 6-3 in his final round-robin match to extend his winning streak to 20 matches since his loss to Nadal in the US Open final in September.
Federer and ...
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