BTW, I think this event is outdoor hardcourt. (title says indoor)
I found this on the ATP site
The Chengdu Open tennis tournament is played on outdoor hard courts. While the Sichuan International Tennis Center has both indoor and outdoor courts, the professional ATP tournament utilizes the outdoor hard courts.
I think the whole Chinese / Japanese run is outdoor, the first indoor events are post Shanghai and when we hit Kazakhstan and the run of European events