Novak Djokovic won the 2021 Wimbledon which gave him an additional 2000 ATP points in the Race to Turin. Djokovic added a combined 4000 points in the span of a month between Roland Garros and Wimbledon which was enough for him to qualify for the ATP Finals.
The Serbian also won 2000 points at the Australian Open which helped the endeavour. Djokovic said on the qualification:
"I am happy to have qualified for Turin so early. Italian fans are very much into tennis so I am sure it will be a great event with a fantastic atmosphere."
The 2021 ATP Finals will be his 14th Finals overall and ATP Chairman Andrea Gaudenzi said:
"Novak’s results this season have been nothing short of extraordinary. The Nitto ATP Finals is reserved for the best and qualifying for a 14th time reflects the excellence he brings, year after year. We look forward to witnessing him continue to chase history in Turin.”