Andy Murray believes it would rank as one of the greatest achievements in tennis history if Novak Djokovic were to win a fourth successive grand slam.
The world number one already holds the Wimbledon, US Open and Australian titles and needs the French Open to become the first man since Rod Laver in 1969 to make it four in a row.
Roger Federer and Rafael Nadal have both had the chance to achieve the feat in recent years, the Swiss losing twice in French Open finals to Nadal, who succumbed to knee problems and David Ferrer in the Australian Open quarter-finals last year.
The strength of men's tennis in this era, arguably the best ever, makes Djokovic's run all the more remarkable, and denying Nadal a seventh Roland Garros triumph would surely be the most impressive of the lot.
There are no shortage of brilliant feats in tennis - Laver's two Grand Slams, Federer's 16 slam titles and 23 successive semi-finals and Nadal's clay dominance.
Assessing Djokovic's potential achievement, Murray said: "It would be up there. There's a lot of records that guys have had in streaks. Guys have had incredibly impressive and very, very difficult things to do.
"So I don't know which one is better than the other. But if he was able to do it, which I hope he's not, it would be an unbelievable effort."
Djokovic went into last year's French Open unbeaten in 2011, a run that included two victories over Nadal on clay, before losing to Roger Federer in the semi-finals.
This season Djokovic has lost to Spaniard Nadal in Monte Carlo and Rome though, making Nadal an ever hotter favourite than ever.
Twenty-five-year-old Nadal's record at Roland Garros is remarkable, with his only loss coming against Robin Soderling in 2009 when his knee problems were at their worst.
He shares the record of six titles with Bjorn Borg and a seventh would see him match Pete Sampras' achievement at Wimbledon, the American winning his final SW19 crown in 2000.
Murray, a big admirer of Nadal, expects the Majorcan to surpass that mark, and he said: "I think the fact that he started at such a young age is what's most impressive.
"He won it when he had just turned 19. It's obviously still going as well. So I'm sure he'll have more great runs here. I'm sure he'll win the event a few more times probably before he finishes."
Murray did not want to be drawn into a discussion about whether Nadal or Djokovic's feat would be the more impressive, instead focusing on the remarkable era he is playing in.
"I think both are incredibly difficult," the world number four added. "Roger's obviously won the four slams, Rafa's also done it.
"It would be incredible if a third player does it in a three-year period."
Murray, who is bidding to reach a sixth consecutive grand slam semi-final, will begin his French Open campaign against Japan's Tatsuma on Tuesday.