Back injury forces Wawrinka out of Federer clash in Basel

Back injury forces Wawrinka out of Federer clash in Basel

Back injury forces Wawrinka out of Federer clash in Basel

Wawrinka stands in provisional 14th place within the factors race to the year-end ATP Finals and his possibilities of qualifying now look slim with simply subsequent week's Paris Masters to play on the common schedule.

Wawrinka, who finished runner-up to Andy Murray last week at the European Open as the Scot won his first singles title since returning from hip resurfacing surgery, cited a back issue as the reason for his withdrawal.

Stan Wawrinka, who was set to take on countryman Roger Federer in a last-eight game, withdrew in Basel.

Wawrinka hammered 14 aces - his last two in the penultimate game.

Wawrinka saved two break points when serving at 5-5 in the decider, then converted his second match point after six deuces in the next game. "I'm very happy with the way I played".

Third seed Stefanos Tsitsipas had to fight back to avoid an upset against Ricardas Berankis, the Greek recovering to seal a 6-7 (4-7) 6-2 6-4 triumph.

"He was giving me a hard time in the first set, it was not easy to overcome, we had a high-quality match", said Tsitsipas, the world number seven.

"I've really enjoyed every moment and I've always tried to understand how I should take advantage of the fact that I'm playing at home and have home court". "It can give you an extra reason to fight".

In other second-round action, the United States' Reilly Opelka edged sixth-seeded David Goffin of Belgium 6-7 (4), 7-6 (4), 7-5, and fourth-seeded Roberto Bautista Agut of Spain topped France's Richard Gasquet 6-2, 4-6, 6-3.

Goffin entered this week at provisional 10th in the race and is duelling with Italy's Matteo Berrettini, who now stands eighth, and ninth-placed Roberto Bautista Agut. They have faced each other just once in Basel, in a 2011 semifinal won by Federer.

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