Rafael Nadal ruled out of London event — ATP Finals

Nadal's spot in the ATP Finals will be taken by John Isner, who has been drawn in the same group a Djokovic, Alexander Zverev and Marin Cilic.

Rafael Nadal announced Monday he has cut his season short because of more health setbacks.

The Spaniard has been struggling with an abdominal injury and was forced to pull out of the Paris Masters last week.

In a post on social media, 17-time Grand Slam champion Nadal wrote: "It has been a complicated year, very good at the tennis level when I was able to play, and at the same time very bad as far as injuries are concerned". Unfortunately, Paris had a problem with his stomach and my ankle there is a foreign body, which today it is necessary to remove during surgery.

His decision means he will lose the end-of-season world No 1 ranking to Novak Djokovic.

"This way I hope to be in full condition for the next season", he said, and thanked his supporters.

Meanwhile, Kei Nishikori has been drafted into the tournament following the withdrawal of Juan Martin del Potro due to a right knee injury.

Nadal, who was overtaken by Djokovic at the summit of the men's rankings on Monday, remains without a victory at the season-ending tournament and brings to an end a campaign which has seen him win the French Open, three Masters 1000 titles and lose only four matches.

"Reflecting on what I've been through in the a year ago, it's quite a phenomenal achievement", Djokovic said. Anderson came from two sets down to defeat Federer in their Wimbledon quarterfinal in July. "And, of course, I'm very, very happy and proud about it".

Dominic Thiem has also had a great season, reaching his first Grand Slam final at Roland Garros and improving a lot on hard courts with a first indoor title in St. Petersburg.

So, if the shoulder injury that hindered him in the Paris Quarter-Final against Khachanov has been dealt with properly, he will be a force to reckon with in London.

  • Steve Townsend