World No 1 will face Thiem after 6-3, 7-6 (4) victoryTop four players in world will contest semi-finalsNovak Djokovic defeated Alexander Zverev to set up a semi-final clash against
US Open champion Dominic Thiem at the Nitto ATP Finals.
![Djokovic reaches ATP Tour Finals semis with straight-sets win over Zverev](https://i.guim.co.uk/img/media/a26a56cfa29d89e316d8032f43a0756b5213b23e/0_52_3500_2101/master/3500.jpg?width=1200&height=630&quality=85&auto=format&fit=crop&overlay-align=bottom%2Cleft&overlay-width=100p&overlay-base64=L2ltZy9zdGF0aWMvb3ZlcmxheXMvdGctZGVmYXVsdC5wbmc&enable=upscale&s=f0e7bc8d2ea175e30e8364bd73b537bb)
For the second day in a row at London’s O2, one of the world’s top two
Tennis players found himself in a straight shoot-out for a place in the last four. And Djokovic emulated
Rafael Nadal, who beat Stefanos Tsitsipas, by seeing off 2018 champion Zverev 6-3 7-6 (4).