Roger Federer, 36, aims to become oldest world No.1 tennis player

Roger Federer will play in the ATP 500 event in Rotterdam  - if he makes it to semi-finals, he will have a chance to become the oldest world number one tennis player in history.

Roger Federer: The second 40-something to rank in the Top 10

Roger Federer says he is retiring from pro tennis at age 41

Roger Federer inspires global devotion like no other at Wimbledon

How Roger Federer could wipe Andre Agassi from record books as

Roger Federer becomes the oldest man to hold No. 1 ATP ranking

Roger Federer, Swiss tennis great, announces he's leaving the sport

Roger Federer wins Indian Wells quarter-final to retain world No 1

Roger Federer is 36 and No. 1, and he may be playing his best

At 36, Roger Federer Becomes The Oldest Number One Ranked Tennis

Roger Federer says he is retiring from pro tennis at age 41

The Relentless Longevity of Novak Djokovic - WSJ

Roger Federer, after 20 Grand Slam titles, announces retirement