Zheng and partner , Austrian Alexander Peya face second seeds Sania Mirza and Ivan Dodig .
Xu and mixed doubles partner Fabrice Martin face top seeds Bethanie Mattek - Sands and Mike Bryan from the U.S for a quarterfinal berth .
Zheng and partner , Austrian Alexander Peya face second seeds Sania Mirza and Ivan Dodig , while Xu and mixed doubles partner Fabrice Martin face top seeds Bethanie Mattek - Sands and Mike Bryan from the U.S for a quarterfinal berth .