Tennis fans could see Roger Federer and Rafael Nadal's rivalry continue for years to come, according to Carlos Moya.
The Spaniard, a former world number one, who won the French Open back in 1998, believes that the duo can remain at the peak of their powers well into their 40s.
Both Federer - who became the oldest player to be ranked at number one on the APT Men's Tour Rankings earlier this year - aged 36, and Nadal, who has also battled back from knee issues to fight back to the summit of the rankings in recent months, are reaching their final few years in the game, or as so many of their fans think.
However, with the two players jostling it out for top spot in the rankings, Moya, who took over as Nadal's coach, replacing his Uncle Toni prior to the start of the Australian Open, believes that age is just a number for the pair.
"He is 31, he won everything, and yet he wants to improve," Moya told Corriere della Sera, per The Express.
"And he is open to new ideas."
Nadal, who is preparing for the upcoming clay court season, which will see him aim to defend his crown under the Parisian skies at Roland-Garros, will also be in action for Spain, representing his country in the Davis Cup in April.
And Moya also feels the evergreen Federer could remain a force to be reckoned with even after hitting 40.
Federer has enjoyed nothing short of a stellar career during his two decades at the top of professional tennis, winning every single Grand Slam, including Wimbledon eight times and the Australian Open six times.
"Until Saturday, he (Federer) was the world No 1 at 36," he continued.
"At my time, in the 90s, at his age, we were retired for six or seven years but Roger is phenomenal.
"Rafa as well, at the top of the rankings as a 31-year-old, it's not bad!
"I wouldn't be surprised to see them still there in their 40s."News Now - Sport News