World number three Coco Gauff beat Ekaterina Alexandrova 7-5 6-3 in her debut at the China Open.
American Gauff, 19, had not played since winning her first Grand Slam title at the US Open in September.
She extended her unbeaten run to 13, having won 19 of 20 matches since a first-round exit at Wimbledon and faces world number 48 Petra Martic next.
Elsewhere, Petra Kvitova criticised the scheduling after her 6-4 7-5 second-round loss to Liudmila Samsonova.
The Czech two-time Wimbledon champion had a late finish to her first-round match on Sunday against China's Wang Xiyu and was back in action on Monday.