Roger Federer has been crowned ATP World Tour Champion for the fifth time, after becoming just the second player in the history of the South African Airways ATP Rankings to regain the year-end No. 1 ranking.

Federer clinched the 2009 ATP World Tour Champion title by beating Andy Murray at the Barclays ATP World Tour Finals tonight. Federer and rival Rafael Nadal, the 2008 ATP World Tour Champion, had entered the prestigious circuit finale at The O2 in London locked in a two-man battle to conclude the season atop the South African Airways 2009 ATP Rankings. Nadal lost his first match putting Federer in a position to gain the number one position if he won just one match, which he did.

“It means a lot to have returned to No. 1 and to finish the year again at No. 1,” said Federer. “It was an incredible year for me both on the court and off the court and to be able to break the all-time Grand Slam record and finish the year on top is amazing.”