LONDON -- Roger Federer opened his quest for a seventh season-ending tour title, looking like the man to beat again.
The 17-time Grand Slam champion won his record 40th match at the tournament, defeating Janko Tipsarevic 6-3, 6-1 Tuesday in his opening Group B match.
Federer lost only eight points on his serve under the roof of the O2 Arena while converting four of his nine break points in the event that features the top eight players in the world.
"Obviously, come in knowing that I've played so well past years, I expect myself also to be at a solid level," said Federer, who also won his seventh Wimbledon title this year and won a silver medal at the London Olympics. "I've had a good year. It's true, I feel like I'm striking the ball well after today. I hope it's a sign for more to come."
A day after Andy Murray made his return to Britain for the first time since winning the U.S. Open, the crowd got into Tuesday's match, complete with cowbells ringing and constant chanting for Federer.
"I'm very, very honored, really, and very proud in some ways to be so well liked by so many fans around the world, just not in one particular place or one country," said Federer, who will next face David Ferrer on Thursday. "It really seems to be everywhere I go I get a lot of fan support."
The Swiss star didn't disappoint them, looking like he was right at home right from the start.
He held at love to open the match and broke Tipsarevic for a 2-0 lead that held the rest of the way. In the second set, Tipsarevic held serve to start, but couldn't win another game as Federer dazzled the fans with a couple of behind-the-back shots off Tipsarevic serves that had nipped the net.
"The problem was that he got an early break in both sets," Tipsarevic said. "Everybody knows that when Roger starts leading, he is probably the best player in the world when he's a break up early in the set."
Tipsarevic was playing for the first time since retiring with dizziness and fatigue during his quarterfinal match at the Paris Masters last week.
"I felt good in the first set," Tipsarevic said. "Even though I lost it, I didn't lose the first set because I was feeling bad, whatever. But later on when we played these longer rallies, my serve started to suffer a little bit."
Federer didn't play in Paris, pulling out to rest up for London.
"I still had some little things I had to work through the last couple of days. Really since yesterday, I feel fine," Federer said.
Federer twice won the season-ending tournament when it was in Houston in 2003-04, and then won two more in Shanghai in 2006-07. In London, he is the two-time defending champion.
The victory moved him out of tie with Ivan Lendl for the most wins at the tournament.
In the other Group B match, Ferrer beat Juan Martin del Potro 6-3, 3-6, 6-4.