Decimated US Open field suggests Djokovic can complete a calendar Grand Slam
Since 2002 Federer, Djokovic, Nadal and Murray have been only winners of men's title
Tall German had served for first set before Djokovic went through the gears
40-year-old Croatian beats fellow veteran Feliciano Lopez in first round
Leading players must take responsibility for guiding sport during this period of change
He reveals key to injury return after beating Juan Martin del Potro in US Open final
Rafael Nadal was forced to retire in his semi-final while Djokovic saw off Nishikori
Next up for the top seed is a semi-final clash with big-serving Juan Martin del Potro
Defending champion Rafael Nadal in ominous form as he progresses to third round
The Argentine has overcome injury problems to book a place in the quarter-finals
The Spaniard overcomes Diego Schwartzman’s challenge in rain-delayed match
Australian Open champion gamely defends his title with five set win over Marin Cilic
Earlier, Roger Federer maintained his perfect record in racing through to the last eight
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