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.

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Roger Federer returns to top of ATP rankings; oldest ever at 36 - ESPN

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

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Roger Federer says he won't walk away from tennis, promising his

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Top of The World: Roger Federer, 36, Becomes Oldest Number One

Roger Federer - Wikipedia

Roger Federer announces his retirement from the ATP Tour and

How Roger Federer Upgraded His Game - The New York Times

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

Roger Federer, world's oldest No.1 tennis star, has a new target

Roger Federer Pursues the No. 1 Ranking Again. Why Not? - The New