![21.11.2015. The O2, London, England. ATP Tennis Tour Finals. Day 7. Stan Wawrinka (SUI) [4] in action in his semi final match against Roger Federer (SUI) [3]. Federer won the match 7-5, 6-3.](https://m.psecn.photoshelter.com/img-get/I000042XYGdTkIKc/s/500/AP-11683563.jpg)

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21.11.2015. The O2, London, England. ATP Tennis Tour Finals. Day 7. Stan Wawrinka (SUI) [4] in action in his semi final match against Roger Federer (SUI) [3]. Federer won the match 7-5, 6-3.Release:
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