PARIS -- Roger Federer beat Robin Soderling, tied Pete Sampras and won the French Open at last.

Undeterred by an on-court intruder, Federer defeated surprise finalist Soderling 6-1, 7-6 (1), 6-4 on Sunday to complete a career Grand Slam and win his 14th major title, matching Sampras' record.

"It's maybe my greatest victory, or certainly the one that removes the most pressure off my shoulders," Federer said. "I think that now and until the end of my career, I can really play with my mind at peace, and no longer hear that I've never won Roland Garros."

On his fourth try in a Paris final, Federer became the sixth man to win all four Grand Slam championships.

"Now the question is: Am I the greatest of all time?" Federer said. "We don't know, but I definitely have many things going for me because I've finally won all four Grand Slams, and I'm particularly happy reaching Pete's 14."

Sampras said Federer deserves to be at the top of the all-time list.

"I'm obviously happy for Roger," Sampras told The Associated Press in a telephone interview from Los Angeles, where he lives. "Now that he has won in Paris, I think it just more solidifies his place in history as the greatest player that played the game, in my opinion."

Midway through the match, a spectator ran onto the court and tried to put a hat on Federer. That only briefly delayed Federer's march to the title.

When the stylish Swiss hit a service winner on championship point, he fell on his knees to the clay that had vexed him for so long, screamed and briefly buried his face in his hands. He was teary by the time he met Soderling at the net, and fans gave Federer a standing ovation as he raised his arms in triumph.

The supportive crowd included Andre Agassi, the most recent man to complete a career Grand Slam when he won at Roland Garros 10 years ago. Agassi presented Federer with the trophy.

The always stoic Roger Federer allowed a fist pump during his straight-sets victory over Robin Soderling in the French Open final. Ryan Pierse/Getty Images

"I'm so happy for you, man," Agassi said.

"You're the last man to win all four Grand Slams," Federer said. "Now I can relate to what it really feels like. ... It feels good to be for once on the podium as the winner. It's a magical moment."

Tears ran down Federer's cheeks as the Swiss national anthem played.

"Roger, really, congrats to you," Soderling said. "You really gave me a lesson in how to play tennis today. And to me you're the greatest player in history. So you really deserved to win this title."

Federer owed Soderling a thank-you for easing his path by upsetting four-time defending champion Rafael Nadal in the fourth round.

"I kind of was relieved, because he was going to be the hardest one to beat," Federer said.

Nadal defeated Federer at Roland Garros the past four years, including three consecutive times in the final.

A matchup against the No. 23-seeded Soderling was much more inviting. The Swede had never previously been beyond the third round at a Grand Slam tournament, and he fell to 0-10 against Federer.

"Yesterday, me and my coach were joking," Soderling told Federer during the trophy ceremony. "You've beaten me nine times in a row, and we were joking nobody can beat me 10 times in a row. But we were wrong."