The 33-year-old was in virtuoso form to charge past the 27th seed 6-1, 6-2, 6-4 in hot sunshine on Rod Laver Arena and make the round of 16 at Melbourne Park for a 13th time.
David Goffin claims an upset 6-4 7-6 (3) victory over world number one Rafael Nadal in Sydney to keep Belgium alive in their quarter-final clash at the inaugural ATP Cup team event.
Casper Ruud, a product of Nadal's tennis academy in Mallorca, has beaten top-20 players John Isner and Fabio Fognini to make his mark at the international teams tournament in Australia.
Novak Djokovic and Rafael Nadal urged organisers of the ATP Cup and Davis Cup Finals to consider a possible merger, saying it makes little sense to have two men’s team competitions on the tennis calendar.
Big pay rises are in store for players at January's Australian Open with organisers announcing a boost in the total purse to almost $50 million.
The top-ranked Nadal won all of his eight matches at the revamped competition that debuted a World Cup-style format.
The underwhelming performance of the reigning champions will most likely require them to beat Rafael Nadal's Spain to stand a chance of reaching the knock out phase.
After a 7-5, 7-5 defeat to Dominic Thiem in his tournament opener, six-time champion Roger Federer may find it tricky to qualify for the last four of the ATP Finals.
The 32-year-old Serbian tennis star avenged his loss to the 21-year-old Greek 3 weeks earlier in the Shanghai Masters, with a 58-minute victory.
Meanwhile, world number one Novak Djokovic defeated Britain’s Kyle Edmund with 7-6(7) 6-1 to reach the Paris Masters quarter finals.
The 33-year-old Spanish left-hander moved one shy of Roger Federer's all-time men's record 20 Grand Slam triumphs and became the second-oldest New York champion in the Open era after Ken Rosewall in 1970 at age 35.
Grigor Dimitrov, 78th-ranked, delivered a stunning upset of Roger Federer in the US Open quarter-finals, fighting back for a 3-6, 6-4, 3-6, 6-4, 6-2 triumph over the Swiss star who had beaten him in all seven of their prior meetings.
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