Germany's Alexander Zverev, left, and Austria's Dominic Thiem talk after the semi final men's singles tennis match at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077299
Austria's Dominic Thiem reacts during the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077298
Austria's Dominic Thiem reacts during the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077297
Austria's Dominic Thiem serves a ball during the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077296
Germany's Alexander Zverev, left, and Austria's Dominic Thiem hug each other after the semi final men's singles tennis match at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077295
Austria's Dominic Thiem reacts during the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077293
Austria's Dominic Thiem serves a ball during the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077294
Austria's Dominic Thiem reacts after winning the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077288
Austria's Dominic Thiem reacts after winning the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077292
Austria's Dominic Thiem returns a shot during the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077291
Austria's Dominic Thiem returns a shot during the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077290
Austria's Dominic Thiem reacts during the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077289
Austria's Dominic Thiem reacts after winning the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077287
Austria's Dominic Thiem reacts after winning the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077285
Austria's Dominic Thiem reacts after winning the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077284
Austria's Dominic Thiem reacts after winning the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077283
Austria's Dominic Thiem serves a ball during the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077282
Austria's Dominic Thiem returns a shot during the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077280
Austria's Dominic Thiem reacts after winning the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077279
Austria's Dominic Thiem reacts after winning the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077277
Austria's Dominic Thiem reacts after winning the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077278
Germany's Alexander Zverev serves a ball during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077272
Germany's Alexander Zverev returns a shot during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077271
Germany's Alexander Zverev adjusts his rocket during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077270
Germany's Alexander Zverev reacts during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077269
Germany's Alexander Zverev returns a shot during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077268
Germany's Alexander Zverev returns a shot during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077266
Germany's Alexander Zverev returns a shot during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077267
Germany's Alexander Zverev reacts during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077265
Germany's Alexander Zverev adjusts his rocket during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077263
Germany's Alexander Zverev returns a shot during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077264
Germany's Alexander Zverev reacts during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077262
Germany's Alexander Zverev reacts during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077261
Germany's Alexander Zverev returns a shot during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077260
Germany's Alexander Zverev reacts during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077259
Austria's Dominic Thiem arrives at the semi final men's singles tennis match against Germany's Alexander Zverev at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077124
Germany's Alexander Zverev returns a shot during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077123
Germany's Alexander Zverev returns a shot during the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077122
Germany's Alexander Zverev arrives at the semi final men's singles tennis match against Austria's Dominic Thiem at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6077121
Greece's Stefanos Tsitsipas celebrates his victory at the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076736
Greece's Stefanos Tsitsipas celebrates his victory at the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076735
Greece's Stefanos Tsitsipas celebrates his victory at the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076734
Greece's Stefanos Tsitsipas and Switzerland's Roger Federer shake hands after the semi final men's singles tennis match at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076733
Greece's Stefanos Tsitsipas reacts during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076731
Greece's Stefanos Tsitsipas reacts during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076730
Greece's Stefanos Tsitsipas returns a shot during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076729
Greece's Stefanos Tsitsipas returns a shot during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076728
Greece's Stefanos Tsitsipas reacts during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076727
Greece's Stefanos Tsitsipas reacts during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076726
Greece's Stefanos Tsitsipas returns a shot during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076725
Greece's Stefanos Tsitsipas reacts during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076724
Greece's Stefanos Tsitsipas reacts during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076723
Greece's Stefanos Tsitsipas returns a shot during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076722
Greece's Stefanos Tsitsipas returns a shot during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076721
Greece's Stefanos Tsitsipas returns a shot during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076720
Greece's Stefanos Tsitsipas reacts during the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076719
Greece's Stefanos Tsitsipas arrives at the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076717
Greece's Stefanos Tsitsipas arrives at the semi final men's singles tennis match against Switzerland's Roger Federer at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076716
Switzerland's Roger Federer arrives at the semi final men's singles tennis match against Greece's Stefanos Tsitsipas at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076715
Switzerland's Roger Federer arrives at the semi final men's singles tennis match against Greece's Stefanos Tsitsipas at the ATP World Tour Finals tournament in London, Britain.16.11.2019#6076714
