London:Cristiano Ronaldo scored his sixth goal in three games and Manchester United beat Reading 3-2 on Sunday to move six points clear of Chelsea in the Premier League. Chelsea, the two-time defending champions, was held 2-2 by Fulham in a London derby. The Blues have now dropped four points in two home games in five days after Tuesday's 2-2 draw with Reading. Arsenal lost 1-0 at Sheffield United to drop two places to fifth, 17 points behind Man United. Ferguson's birthday At Old Trafford, Ole Gunner Solskjaer also scored in the Red Devils' 17th league win this season, one day before manager Alex Ferguson's 65th birthday. Ibrahima Sonko and Leroy Lita scored for Reading. "It's been a very good day for us," Ferguson said. "Some of our football was very good. The play was excellent at times. "But we had our worst defending of the season. It was a slack goal for us to lose," he said of Reading's 89th-minute goal. "We resorted to playing safe football instead of playing the way we usually play." At Stamford Bridge, defender Moritz Volz put Fulham up 1-0 in the 16th minute by scoring the 15,000th Premier League goal since the competition began in 1992. Defender Liam Rosenior deflected Frank Lampard's shot into Fulham's net in the 35th, before Didier Drogba scored his 20th goal of the season in the 62nd to put Chelsea 2-1 up. But United States defender Carlos Bocanegra equalized for Fulham with a goal in the 84th.