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Roger Federer has spent the past nine years being ranked no lower than No. 3 in the world.

From February 2004 to August 2008, he spent 237 consecutive weeks ranked as the No. 1 tennis player in the world.

Federer has established himself as one of the greatest tennis players to have played the sport, winning 16 Grand Slam titles, 74 total singles titles, eight doubles titles and an Olympics Gold Medal in doubles.

With an overall record in singles of 838-190, he ranks sixth all-time in wins on the ATP World Tour.

There was a time when stepping onto the court against Federer meant an almost certain loss for his opponent, but that time has passed.

In the last two years, Federer has not won more than four singles titles, with none of them being a Grand Slam.

Roger Federer has passed his prime, and here are five reasons he should retire at the end of the 2012 season.