Switzerland's Roger Federer defeated Serbia's Janko Tipsarevic 6-3, 6-1 on Tuesday at the Barclays ATP World Tour Finals, coming away with a record 40th match win in the season-ending tournament.

"I'm happy with my level of play today against Janko, who is obviously a good player. I think it's nice conditions here. 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 hopefully," the Swiss star said after the match at London's O2 Arena.

Federer, who has won the season-ending championships six times, has beaten Tipsarevic all six times they have met on court, never dropping even a set in five of his matches against the hard-charging Serb.

The 31-year-old Federer, who has won 17 Grand Slam titles, is ranked No. 2 in the world.

Federer won his 7th title at Wimbledon in July, defeating Scotland's Andy Murray 4-6, 7-5, 6-3, 6-4.

The Swiss star regained the No. 1 ranking after winning Wimbledon, but his loss to Argentina's Juan Martin del Potro at the Swiss Indoors in his hometown of Basel last month and decision to pull out of the Paris Masters allowed Serbia's Novak Djokovic to grab the top spot in the rankings.

The Barclays ATP World Tour Finals, a year-end event limited to the top eight players in the ATP rankings, is regarded as the fifth-most prestigious tournament on the men's tennis calendar after the four Grand Slams. EFE