Andre Agassi, the last man to complete a career Grand Slam 10 years ago, said on Saturday that Roger Federer will be more deserving of the rare achievement if he wins the French Open on Sunday.
Agassi's Roland Garros win here in 1999 made him only the fifth man in history to have won all four majors - Wimbledon, US Open, Australian Open and the French Open.
The American also believes that had it not been for four-time champion Rafael Nadal, whom he described affectionately as a 'freak of nature', the Swiss star would have already ended his recurring Paris nightmare.
"It could be his destiny. Roger deserves it more than I did. To win on all four surfaces in your career is one of the greatest achievements in sport," said Agassi.
"It's something that I am so proud of because every surface, and all the different conditions, demands so much of you mentally and physically and reward you so much.
"I'll be pulling for Roger on Sunday. He is extraordinarily talented, and the grace and the way he plays is very special to see.
"If it wasn't for a freak of nature from Majorca, he could have won this many times."
Federer tackles Swedish outsider Robin Soderling, the man who sent Nadal crashing in the fourth round, in Sunday's final in what will be his fourth successive Roland Garros title match.
Nadal has defeated him in the last three, but a win over Soderling will take him level with Pete Sampras as a 14-time major winner.
It will also take him alongside Agassi, Roy Emerson, Rod Laver, Don Budge and Fred Perry as the sixth man to complete a career Grand Slam.
"That it's been 10 years since I did it shows how hard it is to do," added Agassi, who was at Roland Garros with wife Steffi Graf to promote their charity work.
"When I won the Grand Slam, it changed my career and my life. It was the most profound moment, having to overcome all the self-doubt and all the obstacles about what it takes to win here.
"We could see history on Sunday and it will be a privelege for the game to see it. It could be Roger's destiny. It's very exciting."