Marko Djokovic, the younger brother of Novak Djokovic, says the Serbian star won Roland Garros despite having an injury that made him 'scream with pain on every serve.'
Djokovic recently won the Australian Open despite tearing an abdominal muscle in the third round, although it was not the first time he had pulled off such a feat.
He won the French Open in 2016 for the first and, so far, only time to complete his golden slam, but he then suffered a mini-decline due to injury, and Marko Djokovic does not think his Roland Garros achievement gets enough credit given the circumstances.
"In 2016, Novak injured his elbow," Marko told El Mundo. "At that time, I was traveling with him for a few weeks and I remember him screaming in pain at every serve during training.
"Despite this, he emptied himself in Roland Garros and managed to win. Then he was deflated.
"Not only did he suffer a very bad injury but, although he had already reached one of his great goals of the season, people continued to expect more of him: the Olympic Games, the US Open, the world number one, etc."
Marko also offered some insight into how Djokovic ultimately overcame those problems, saying it was simply down to his devotion to self-improvement.
"People say that Novak is playing better than ever and it is because he is working a lot on himself - contemplating his fears and his shortcomings to be more focused when he goes out on the court," Marko explained.
For more exclusive content from Tennisbuzz, including news, features, trivia, promotions and more, please be sure to sign up for our newsletter below or via our home page.
Why not test your tennis knowledge by tackling one of our fiendish quizzes too?