Novak Djokovic needed less than an hour to cruise into the quarter-finals of the China Open at the expense of wildcard Zhang Ze on Thursday.

The world number one did not face a solitary break point as he saw off Zhang 6-2 6-1 in a one-sided second-round match at Beijing's National Tennis Stadium.

Top seed Djokovic, who has won this tournament three years in a row and five times in the last six years, clinically converted four of his five break points to win in only 55 minutes.

Djokovic has a perfect China Open record of 26 victories and no defeats, which has only been bettered in the Open Era by Rafael Nadal's tally of 31 wins in the French Open before suffering his first loss.

The classy Serb visited the Great Wall of China on Wednesday and is eyeing his eighth title of an outstanding year in which he has scaled new heights. 

Djokovic wasted no time in taking control against world number 219 Zhang, breaking in the second game of the match and again to wrap up the opening set.

Rank outsider Zhang had no answer to the 10-time grand-slam champion, who claimed another two breaks in the second set to ease through.

David Goffin will not feature in the quarter-finals after the seventh seed was dumped out by Fabio Fognini.

Unseeded Italian Fognini came up with 21 winners and five breaks to see off Goffin 6-2 2-6 6-2 and set up a quarter-final against Pablo Cuevas.

Cuevas came through his last-16 encounter with Ivo Karlovic 7-6 (7-5) 7-6 (9-7), despite 26 aces from the powerful Croatian, which put him in the record books. 

The giant Croat's total number of aces now stands at a staggering 10,237, 10 clear of previous record holder and compatriot Goran Ivanisevic.