By Mike Dickson for the Daily Mail
Published: 23:09 GMT, 16 November 2020 | Updated: 08:38 GMT, 17 November 2020
Sixteen months after his last Wimbledon triumph, Novak Djokovic got to play in London again on Monday, across town at the O2 Arena.
Yet it was renewed doubts about the viability of January’s Australian Open — the tournament he has dominated like no other — which were on the 33-year-old Serb’s mind.
Melbourne has become Djokovic’s banker tournament — he has won it seven times. After beginning his ATP Finals campaign with a 6-3, 6-2 win over Argentina’s Diego Schwartzman, he admitted he still does not know the structure of a 2021 season that is already fraught with problems.
Novak Djokovic got his ATP finals campaign off