Rafael Nadal has generated many remarkable statistics in his storied career.
Novak Djokovic will begin the week as the top-ranked men's singles player in the world, but it was not the flawless ending he anticipated after suffering a shock loss to Karen Khachanov in the final of the Roles Masters in Paris on Sunday. To win the last tournament of the season - a Masters 1000.
"Five months ago, if you told me that, I would be - I always believe in myself, but it was highly improbable at that time considering my ranking and the way I played and felt on the court".More news: Accused Mexican drug lord 'El Chapo' faces USA trial
Boris Becker believes the draw for the ATP Finals gives Roger Federer a big advantage over Novak Djokovic in next week's tournament in London.
Nadal also announced that he is undergoing a minor ankle procedure, although he made sure to point out that it would not have prevented him from playing at the O2 Arena and is doing it now only because he has time off as a result of the other injuries.
He is three majors off Roger Federer's men's record of 20 Grand Slams.
Rafa Nadal will not take part in the ATP Finals and waves goodbye to the rest of the season.More news: Marsha Blackburn Prevails in Tennessee Senate Race
The 14-time grand slam champion, guaranteed to end the year as world number one, will compete with Zverev, Cilic and debutant Josh Isner - Nadal's replacement - for a place in the semi-finals. In January, he suffered a hip injury that forced his to pull out of the fifth set against Marin Cilic in the Australian Open quarterfinals.
Djokovic's dominant run ended on Sunday when he was beaten 7-5, 6-4 by Russian Kharen Khachanov in the Paris Masters final.
The left-hander excels on the dirt and has won a staggering 11 French Open titles.
In Paris that year, he also became the first player to break through the $100 million (87.8 million euro) prize money barrier.More news: O'Brien's The Cliffsofmoher suffers fatal injury in Melbourne Cup
However, Nadal's primary focus once again next year may well be the clay season.