The 50th anniversary of the first staging of the event has been marked with the naming of two round-robin groups, Tokyo 1970 and London 2020.
The tournament, which starts on Sunday, will be held played at London’s O2 Arena.
Usually a hugely-popular week for tennis fans, this year’s tournament will be held behind closed doors due to the COVID-19 pandemic, which has forced another lockdown in London.
Group Tokyo 1970
- Novak Djokovic
- Daniil Medvedev
- Alexander Zverev
- Diego Schwartzman
Group London 2020
- Rafael Nadal
- Dominic Thiem
- Stefanos Tsitsipas
- Andrey Rublev
Stefanos Tsitsipas– Greek professional tennis player
He is the youngest player ranked in the top 10 by the Association of Tennis Professionals and has a career-high ranking of No. 5 in the world, making him the highest-ranked Greek player in history.