Roger Federer returned to championship form in relentless fashion and marked his intentions for 2011 as he won his fifth year-end title with a 6-3, 3-6, 6-1 victory over Rafael Nadal in the ATP World Tour Finals on Sunday in London.
Federer, ranked second in the world behind Nadal, concluded his season on a high note, winning three titles in his last four events.
"I'm really thrilled the way I played all week," Federer said. "I'm just really happy the way I was able to finish the season in style, playing some of my best tennis, really saving the best for last."
Federer improved to 3-0 against Nadal indoors, though Nadal still leads the career series 14-8, including 6-2 since the start of 2008.
Victory took just over 90 minutes for Federer, who broke Nadal twice in the concluding set as the Spaniard began to feel the weight of his three-hour struggle the day before against Andy Murray.
"In the beginning he was unplayable," Nadal said. "I tried my best this afternoon, but he was better than me."