[1] Erin Routliffe (NZL) and Asia Muhammad (USA) v Xu Yi-fan (CHN) and Yang Zhao-xuan (CHN)

Yang Zhao-xuan and left-hander Xu Yi-fan have been doubles partners at quite a high level for a very long time, so I was expecting a fairly tight match when they played top seeds Erin Routliffe and Asia Muhammad in their quarter-final in Washington.  Yang held serve comfortably to start, but Muhammad had to get through…