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Federer, from 5-2 up in the set, is now serving at 5-5, 15-40 down, despite a stunning stop volley on the opening point.

A backhand stop volley, followed by a pair of forehand passing winners.

Vondrousova dominated the second set with her deep aggressive grounstrokes and clever changes of pace and brought up a break point at 2-2 with a deft stop volley before Suarez Navarro caved in to the pressure and netted a backhand.

A cruel clip of the net and a double fault in the fourth game tipped Konta into a mini crisis, but she rescued one of three break points with a delightful stop volley, and scraped a forehand into empty space for 30-40.

Open third round as a qualifier in 2013, was again the more clinical in the second set, staying aggressive and taking it on his first set point with a deft stop volley that left the Ukrainian floundering.