Dubai: Roger Federer's amazing winning streak continues. The World No 1 defeated unseeded Russian Mikhail Youzhny 6-4, 6-3 to win his 4th Dubai Open title in five years on Saturday night. It was also Federer's 41st consecutive victory tying him up with legendary Bjorn Borg for the 4th-longest streak and leaving him five short of Guillermo Vilas' 1977 record. The Swiss ace beat Youzhny, who upset defending champion Rafael Nadal in the quarterfinals, in straight sets. ÃÂ The Russian, seeking his 2nd crown in two weeks after winning in Rotterdam, was unable to prevent Federer from claiming his seventh straight title. Federer's last defeat was to Andy Murray in the second round of the Cincinnati Masters last August. Meanwhile, India's Mahesh Bhupathi and Radek Stepanek of the Czech Republic lost 7-5, 6-7, 10-7 to France's Fabrice Santoro and Nenad Zimonjic of Serbia in a nail-biting doubles final of the same event.