Kevin Anderson battles past Nick Kyrgios in Chengdu

The Australian appeared on course for a routine straight-sets win as he won the first set 6-3 and then forced two match points in a second set tie-break.

But Anderson rallied to take four straight points to steal the set and then took the third to claim a 3-6 7-6 (8/6) 6-2 victory.

Top seed Dominic Thiem made serene progress against Di Wu in a 6-4 6-4 win while Viktor Troicki beat Marcos Baghdatis 6-3 4-6 6-2 and Albert Ramos-Vinolas saw off Yen-Hsun Lu 7-6 (7/4) 3-6 6-4.

Tomas Berdych edged a tight affair with Mikhail Kukushkin in the Shenzhen Open, taking two tie-breaks in a 7-6 (9/7) 7-6 (7/4) success.

Bernard Tomic needed three sets to beat American Ryan Harrison 6-4 4-6 7-5 while Thomaz Belluci downed Thomas Fabbiano 7-6 (7/2) 7-6 (7/4) and Jiri Vesely got the better of Inigo Cervantes 7-6 (7/2) 6-3.