Big-hitting singles star Kevin Anderson continued his impressive comeback at the highest level by sweeping aside Belgian qualifier Ruben Bemelmans with a commanding 7-6 6-4 7-6 victory in his third-round clash.
He was set to face either No 12 seed Jo-Wilfried Tsonga of France or No 24 seed Sam Querrey of the United States in round four.
Earlier, putting up a tremendous fight after losing their early advantage, Raven Klaasen and American doubles partner Rajeev Ram held their nerve to clinch a narrow second-round win.
In a match that went down to the wire against the Indian pairing of Purav Raja and Divij Sharan, Klaasen and Ram got off to a good start by winning the first two sets.
Their opponents fought back, however, and clinched the next two sets, before Klaasen and Ram grabbed a hard-fought decider to earn a 6-3 6-4 4-6 6-7(6) 10-8 win.
They were set to face Hans Podlipnik-Castillo of Chile and Andrei Vasilevski of Belarus in round three.