In the men's final,
Nadal controlled the match from the start, beating Federer 6-1, 6-3. It was the most lopsided win in the series since Nadal also lost just four games, but over three sets, in the 2008 French Open final against Federer.
Nadal improved to 20-10 in his career against Federer. It was Nadal's fifth title since returning earlier this year from a seven-month layoff due to a left knee injury.
For Williams, her only previous title at this clay-court event came in 2002, when she beat
Justine Henin in the final.
That was also the year she won her only title at Roland Garros. Last year in Paris, Williams lost in the opening round of a major for the first time, falling to 111th-ranked
Virginie Razzano of France.
"She definitely showed incredible tennis today," Azarenka said of Williams. "But I don't think the score says how close the match was. She was better at the key moments."
She didn't drop a set while winning this title.
Federer had also not dropped a set all week, but he had no reply for Nadal's topspin-heavy groundstrokes. The 17-time Grand Slam winner attempted serving and volleying, but he either missed the volley or Nadal passed him with the return.
Federer lost more points, 10, than he won, nine, at the net. He also committed 32 unforced errors to Nadal's eight.
Center court at the Foro Italico was packed to the limit with 10,500 fans, but the crowd didn't get to see too much tennis. The men's final took only 1 hour, 9 minutes, and the women's final lasted only slightly longer.