NOVAK DJOKOVIC and Roger Federer notched up contrasting victories to reach the Shanghai Masters quarter-finals while David Ferrer fought back from a set down to knock out Andy Murray.
World number one Djokovic laboured to a 6-3 4-6 6-4 victory over plucky Kazakh Mikhail Kukushkin who matched the Serb shot for shot for most of the match before being overpowered in the third set.
Two-time champion Djokovic broke Kukushkin for a 5-3 lead before closing out the first set but the Kazakh roared back into contention to stretch the contest to a decider.
Djokovic broke his opponent in the fifth game of the third set before extending his winning streak in China to 27 matches and seal a quarter-final clash with Ferrer. "I congratulate him for fighting," Djokovic said of Kukushkin. "But I'm really glad to come out as the winner and stay mentally strong. That's why I won. I won because I fought my way through."
Ferrer overcame Murray 2-6 6-1 6-2 and the Spaniard will now replace the Briton in ninth spot in the race for the season-ending ATP World Tour Finals in London. There are five berths still up for grabs in the eight-man tournament.
Murray had little trouble in the first set and looked poised for a quarter-finals berth, but Ferrer staged a brilliant comeback, breaking the Briton twice to take the second and level the match.
There was no let up in the final set either as the Spaniard raced to a 5-2 lead and raised his arms in celebration when twice champion Murray buried a return into the net.
An in-form Ferrer would prove a difficult opponent, said Djokovic.
"We all know how competitive David is. To (beat) Murray is a big win for him. So I'm sure that he's confident. He runs. He's (been) one of the toughest competitors around for so many years. I expect another exhausting match."
Murray joined world number two Rafa Nadal, Australian Open champion Stan Wawrinka and US Open finalist Kei Nishikori in exiting the tournament before the quarter-final stage.
The Briton said he had not made up his mind yet about where he would compete next as he bids to qualify for the ATP Finals for the seventh successive year.