"I don't think it really made much different at that stage," said Wolmarans, who now faces Joseph Sirianni of Austria in the quarterfinals.

Sirianni advanced after outclassing Marco Chiudinelli of Switzerland 3-6 6-3 7-6 (12-10) in a 2hr 30min marathon.

Equally dour, dogged and vacillating was Israeli Harel Levy's 7-5 5-7 7-6 (12-10) grinding win over Austria's Steven Koubek in 2hr 24min, with Kkoubek also surrendering a match-point in the third-set tiebreaker.

In contrast, Brazilian fourth-seed Thiago Alverez joined the last eight after Frenchman Edouard Roger-Vasselin retired with a foot injury when trailing 3-1 in the opening set.

The Soweto Open is part of the ATP challenger tour, a springboard circuit for up-and-coming players to earn ranking points to enter the world tour, and will be followed by an ITF women's event.

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