Defending champion Tomas Berdych survived a second-set scare to book his place in the Shenzhen Open semi-finals with a last-eight victory over Jiri Vesely.

The top seed clinched the opener on a tie-break, before being pegged back by his fellow Czech to set up a decider.

But Berdych recovered to clinch the third in convincing fashion and come away with a 7-6 (7-1) 3-6 6-2 victory, setting up a clash with Thomaz Bellucci.

The Brazilian claimed the scalp of fourth seed Bernard Tomic, winning 6-2 6-2, while Richard Gasquet saw off qualifier Mischa Zverev in two hard-fought sets, prevailing 7-6 (7-4) 7-6 (7-2).

Gasquet will now face Janko Tipsarevic, who beat Malek Jaziri 7-6 (8-6) 6-2.

The biggest upset at the Chengdu Open came as top seed Dominic Thiem fell to Spain's Albert Ramos-Vinolas 6-1 6-4.

Third seed Grigor Dimitrov awaits Ramos-Vinolas in the semi-finals, while Karen Khachanov and Viktor Troicki will contest the other last-four clash following victories over Feliciano Lopez and Kevin Anderson respectively.

World number 101 Khachanov has been on a fine run, having seen off seventh seed Joao Sousa in the first round before sending fourth seed Lopez packing on Friday.