Six-time Roland Garros champion Bjorn Borg believes victory for Roger Federer in the French Open final will confirm the Swiss maestro as the best player to ever grace the sport.

The world number one is bidding for his first title on the red clay in Paris after slipping to defeat in the final in each of the last two years against Rafael Nadal, who tomorrow will again stand between Federer and his place in the history books.

Nadal is unbeaten in 27 matches at Roland Garros, winning the title for the past three years, but Federer has plenty of motivation to bring an end to that extraordinary run, with victory on Sunday set to bring him a career Grand Slam of the majors.

Should he succeed, Federer would become just the sixth man in history to achieve the feat, but Borg believes the achievement would elevate the 26-year-old above those who went before.

"If Roger wins tomorrow in Paris, he will definitely be the greatest player ever to play the game," Borg told a press conference at Roland Garros today. "I mean, he (will have) won all the tournaments.

"That's my opinion though. I'm sure other people will have different opinions. But he (would have) won everything, and what he did and what he achieved in tennis, it's incredible."

Federer's only defeats in 14 grand slam final appearances have come with those Paris losses to Nadal in 2006 and 2007.

Victory for Nadal on Sunday will also bring with it a little moment of history, as the 22-year-old Spaniard will match Borg's record of four straight titles at Roland Garros.

Few would bet against him on current form, either. In six matches on his way to the final, Nadal has not dropped a set and has lost just 37 games in total. His straight-sets demolition of third seed Novak Djokovic on Friday only served to underline those remarkable statistics.

"If Nadal can win for the fourth time it will be an incredible achievement," Borg continued. "The competition today is really tough with a lot of good players around.

"To win tournaments and to win grand slams, it's a hell of an effort."

Borg, who won 11 grand slam crowns during his playing days in the 1970s and early 1980s, tipped Nadal to not only equal his record of six Roland Garros, but to go on and better it.

He said: "He's only 22. He has so many more years to win many more titles on clay. He's maybe going to win seven, eight French Opens."