Roger Federer is one of the greatest sporting athletes of all time, let alone one of the best tennis players to have ever lived.

The tennis great's all-conquering triumph at Wimbledon earlier this month was Federer's 19th major title in a stellar career; the most of any player in tennis history.

He now leads the standings by four over his great rival, Rafael Nadal, who has attained 15 major titles of his own.

Despite being just shy of his 36th birthday, Federer's recent rediscovered dominance has left experts baffled to how he has managed to stay at the top of his game despite his age.

But Toni Nadal, coach and uncle of Federer's great rival, Rafael Nadal, has revealed that the Swiss has achieved so much recently despite not having the same discipline as his rivals.

Following on from a chat with the 19-time major winner's manager, Tony Godsick, Nadal wrote in a column for El Pais: "I always liked to figure out what successful person on a professional level do. In this case, we spoke about Roger, and instead of what I thought, he is not a very disciplined or methodical player. He doesn't take care about diet or resting.

"He (Godsick) told me that at any moment he asked him to see stats and specific data that you can have through technology, Roger refused to do it. He told him he liked to play using more variety and that he didn't like to see numbers on what he did."

Nadal added that Federer has been so successful due to his ability to adapt and bring variety to his game, meaning he can still perform at the highest level despite being in the twilight of his career.

The Spaniard commented, "Only a few athletes have dominated like him in the sport. Roger's game hasn't any weakness and is very elegant. In 2013 many people believed he was done and that he was going through a decline at 31 after a very satisfying career.

"For what we saw then, he wasn't done. In the same year he added Stefan Edberg in his team, changed racket, adopted a new strategy that allowed him to shorten points, going to the net more and being faster.

"I support the ability to make changes despite you got good results with the things you are willing to modify. It means you are smart and that's the key to have a longer career."

Despite turning 36 next month, Federer's resurgence in form comes after a five-year period where the Swiss struggled for form and fitness.

Heading into 2017, Federer had not won a major title since 2012, but he ended that drought earlier this year when he triumphed at the Australian Open.

After missing the French Open to rest, he was in imperious form at the year's third major as the Swiss did not drop a set en route to winning his eight Wimbledon title.