Top seed Tomas Berdych responded to his surprise early St Petersburg Open exit by beating Austin Krajicek on his Shenzhen Open debut to reach the quarter-finals.
Berdych, the world number five, was humbled by Simone Bolelli in his first match of the tournament in Russia last week, but avoided another upset on Wednesday by seeing off Krajicek 7-5 6-3.
An all-Czech encounter with Jiri Vesely is next up for Berdych, who is striving to securing his place in the ATP World Tour Finals for the sixth consecutive year.
It all started so well for American Krajicek, who broke the favourite to love in the opening game of the match, but was soon pegged back at 2-2.
The unseeded Krajicek saved two set points to level at 5-5, but Berdych avoided a tie-break by breaking to love to wrap up the set and then allowed his opponent just two more break points as he moved into the last eight.
Berdych is looking to end his wait for a first ATP World Tour title of the year, but will be braced for a stern examination from Vesely in the first contest between the two at Tour level.
Sixth seed Vesely ousted Zhizhen Zhang courtesy of a routine 6-2 6-3 victory.
Last year’s runner-up Tommy Robredo is in contention to go one better than his run to the final in 2014 after the Spaniard started his tournament with a 7-5 6-3 triumph over Japanese qualifier Hiroki Moriya.
Third seed Robredo, who was beaten by Andy Murray in the final 12 months ago, will now face Bolelli after the Italian progressed when Victor Estrella – seeded eighth – retired due to a back injury when trailing 6-0 4-0.