The O2 Arena has hosted the season - ending event since 2009 .
O2 Arena 's agreement had been due to run out after this year , with three - time winner Djokovic previously calling on the ATP to consider switching location .
The O2 Arena has hosted the season - ending event since 2009 but its agreement had been due to run out after this year , with three - time winner Djokovic previously calling on the ATP to consider switching location .