Shenzhen, Guangdong, China, 30 September 2016 | AAP

Bernard Tomic has produced a composed performance to edge out America’s Ryan Harrison in three sets, booking a quarterfinal spot at the Shenzhen Open in China.

Despite an ace count half his opponent’s, Tomic delivered at crucial moments to end Harrison’s three-match winning streak with a 6-4 4-6 7-5 victory in just over two hours.

The fourth-seeded Queenslander withstood 20 aces from Harrison and won fewer first-serve points than the American, but made inroads on his opponent’s second serve to chalk up his eighth ATP World Tour quarterfinal appearance of the season.

He will now meet Brazilian left-hander Thomaz Bellucci for a place in the semifinal.

Defending champion Tomas Berdych advanced to the quarterfinals by beating Mikhail Kukushkin of Kazakhstan 7-6(7) 7-6(4).

The top-seeded Czech is trying to reach his first final of the season.