"I am writing to you to signal the end of the season", Nadal said in a tweet.
Nadal published a statement on social media in which he said it had "been a hard year - very good on a tennis level when I have been able to play and, at the same time, very bad as far as injuries are concerned".
Novak Djokovic is back at No. 1 in the ATP rankings after a two-year absence - and the first man in almost two decades to rise to the top spot after being outside the top 20 in the same season. I really wanted to play in both Paris and London.
Dr Ruiz-Cotorro said of Nadal's recovery: "Now there is a process of progressive recovery ahead of us".
"I think we will reach the new season if everything goes according to plan".
He added that he chose to have the ankle operation so he can start 2019 healthy.
" The ankle injury has bothered me for some time but I have managed the pain". However, since the problem in the abdominal muscle also prevents me from playing in London, we take the time to remove the free body and avoid future problems.
"As such, I hope to be in good condition for next season".
Despite his successes, Nadal's season was marred by health woes.
Back-to-back Australian Opens followed in 2012 and 2013, although three heart-breaking final defeats kept the French Open frustratingly out of reach until 2016, when his breakthrough win at Roland Garros allowed him to complete his career Slam.
So yes, the Swiss legend, Roger Federer and the invincible man from Serbia, Novak Djokovic hold the crest at the tournament.
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