Federer wins World Finals opener

Roger Federer began his bid for a seventh ATP World Tour Finals title with a comfortable win over Serbia's Janko Tipsarevic. With loud backing from a big following at London's O2 Arena, the defending champion eased to a 6-3 6-1 win. Continue reading the main story “I feel like I'm striking the ball well. I hope it's a sign of more to come but I don't want to get ahead of myself” Roger Federer It was a record 40th victory in the season finale for the Swiss star, taking him st Ivan Lendl's 39 wins. David Ferrer plays Juan Martin del Potro in Tuesday's second Group B match at 19:45 GMT. Having pulled out of last week's Paris Masters as a precaution ahead of London, Federer said: "I'm happy with my performance today, no pain any more anywhere. "I'm happy with my level of play against Janko, who is obviously a good player. "Coming in knowing that I've played so well in past years, I expect myself to be at a solid level. I feel like I'm striking the ball well. I hope it's a sign of more to come but I don't want to get ahead of myself. "I'm happy the first one went so well and it takes some pressure off looking ahead in the next couple of matches." Tipsarevic made his O2 debut last year as an alternate, stepping in to play two matches after Andy Murray withdrew, but this is the first time that he has qualified by right. However, the battle to grab the final place in the eight-man event took its toll, and the Serb admitted on Monday that he was not feeling 100% after retiring during his last match in Paris.