Rafael Nadal is second only to Roger Federer on the men's grand slam all-time list - but his uncle says he could have been clear at the top.
Matching Roger Federer and Novak Djokovic for year-end number one rankings pleased Rafael Nadal.
Defending champion Alexander Zverev secured the last remaining semi-final spot at the O2, meaning Rafael Nadal is out.
World number one Rafael Nadal's hopes of reaching the last four of the ATP Finals now rest with Daniil Medvedev.
For the fifth time in his career, Spanish great Rafael Nadal will finish the year as world number one.
Rafael Nadal clinched the year-end number one after Roger Federer eliminated Novak Djokovic from the ATP Finals.
Daniil Medvedev would have won his ATP Finals match against Rafael Nadal 999 times out of 1000, according to the world number one.
Daniil Medvedev looked destined to leave Rafael Nadal on the brink of ATP Finals elimination, but the world number one surged back to win.
After making a sensational comeback on the ATP Tour, Andy Murray would be confident facing Rafael Nadal, Novak Djokovic or Roger Federer.
Defending ATP Finals champion Alexander Zverev was in superb form as he overcame world number one Rafael Nadal in straight sets.