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Stan Wawrinka set up a quarter-final clash with Roger Federer at the Swiss Indoors Basel as he earned a 6-3 3-6 7-5 victory against American Tiafoe.
However, with a back injury making any further participation in the tournament impossible.
“The disappointment is huge,” admitted Wawrinka. Not to be able to play this match in Switzerland is very sad. But I need to listen to my body at this point.”
Federer is looking to win the tournament for the 10th time.