Novak Djokovic and Roger Federer have progressed into the last eight of the Rolex Shanghai Masters after respective straight sets victories.

Djokovic, the world No 1, is now on a 24-set winning streak in Asia dating back to last year’s Shanghai Masters, while Federer remains on the right track for his third title at the tournament.

In order to progress into the quarter-finals, Djokovic ousted John Isner 7-5 6-3 in an hour and 14 minutes.

As is so often the case, Isner hit a wealth of aces during the encounter – nine in total – which took him to 1,007 aces for the year.

It’s the sixth season in a row in which he has reached the 1000 mark, but it wasn’t enough to help him prevail.

Rolex Shanghai Masters – Quarter-finals

Novak Djokovic vs Stefanos Tsitsipas Daniil Medvedev vs Fabio Fognini Matteo Berrettini vs Dominic Thiem Alexander Zverev vs Roger Federer

“It’s always a big challenge returning the serve of Isner,” Djokovic said on the ATP Tour website.

“He’s got one of the biggest serves of all time. He’s one of the tallest guys ever to play tennis. Obviously, with that height, the serve is a huge weapon and huge advantage.

“I managed to kind of read his serve and find a good position on the return, at the end of the first set and also [at the] beginning of the second.”