Australia's Alex de Minaur is through to the second round of the Shenzhen Open where he has joined former world No.1 Andy Murray.
Seventh-seeded de Minaur reached the last 16 in China after beating Yuichi Sugita of Japan 6-3 6-0.
The 19-year-old will next meet American Mackenzie McDonald who was leading 5-7 6-0 5-0 when Slovakia's Lukas Lacko retired.
Former world No.1 Murray also progressed after surviving a stern test from Chinese wildcard Zhang Zhizhen, who retired in the final set.
The Briton faced 10 break points in the match, saving eight of them. It was his first match since losing in the second round of the US Open last month.
Murray will next face defending champion and top-seeded David Goffin, who received a first-round bye.
Elsewhere in the first round, fifth seed Fernando Verdasco saw off Jason Jung 6-3 6-2 while Denis Shapovalov, the Canadian sixth seed, battled past Ilya Ivashka 7-5 2-6 6-3 in a rain-interrupted match which was suspended for more than three hours.
Czech Jiri Vesely, though, lost 7-5 6-1 to Indian qualifier Ramkumar Ramanathan.
Meanwhile, at the ATP Chingdu Open, Australia's No.4 Matthew Ebden brushed aside Evgeny Donskoy 6-3 6-4 to join compatriot Bernard Tomic in the second round.
Ebden needed just 75 minutes to beat Donskoy, helped by nine aces.
His victory moves him through to a second-round meeting with either Italy's Matteo Berrettini or Indian qualifier Prajnesh Gunneswaran.
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