Other action saw World No. 2 Caroline Wozniaki stave off an upset from Wuhan Open runner-up Annett Kontaveit, downing the Estonian in straight sets: 7-5, 6-4.

The first set saw both players fighting hard at the baseline, with Wozniacki relying on backhand slices to wear down her opponent.

Although the first set saw several chances for Kontaveit, she produced too many unforced errors (55 in total) to wrestle control of the match from Wozniacki.

With the victory, Wozniacki has officially qualified for the WTA Finals in Singapore later this year.

Wozniacki set up a meeting with Kiki Bertens in the quarterfinals, who bested Katerina Sinikova earlier today in straight sets: 6-4, 6-3.

On the men's side, Fabio Fognini of Italy logged an easy 6-4, 6-3 win over Russian No. 68 Andrey Rublev.

And in yet another upset, Tunisia's Malek Jaziri beat world No. 2 Alexander Zverev 7-6, 2-6, 6-4 in a marathon match that lasted 2 hours and 33 minutes.

Zverev paid a dear price for only taking four of the 17 break point opportunities that were presented to him. The German only conceded three break point opportunities in the whole match but Jaziri managed to convert on all three occasions.

The Tunisian could only manage to win 33 percent of his second serve points but was able to hold his nerve in a tense tie break to take a 1-0 lead heading into the second set.

Zverev improved in the second set, breaking Jaziri's serve and managing to win 80 percent of his own service points to take the second set 6-2.

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