Roger Federer became the oldest world number one in Tennis history

Twenty-time Grand Slam champion Swiss tennis star Roger Federer has become the oldest world number one in Tennis history.
The 36-year old Federer replaced Rafael Nadal of Spain at the top of the standings after recording a 4-6, 6-1, 6-1 win over Dutch Robin Haase in the quarter-finals of the Rotterdam Open at the Netherlands.
Roger Federer surpassed Andre Agassi of US, who held the top spot aged 33, in 2003.
Federer first became world number one in February 2004 but has not topped the rankings since October 2012. He slipped to 17th in January 2017 after he spent six months out recovering from a knee injury. Since then, the Federer has won eight titles, including Wimbledon last year and two Australian Opens.
Roger Federer Grand Slam Titles: Swiss legend Roger Federer has so far won 20 Grand Slam titles which lists are given below:
1. Wimbledon: 2003, 2004, 2005, 2006, 2007, 2009, 2012, 2017 (8 times)
2. Australian Open: 2004, 2006, 2007, 2010, 2017, 2018 (6 times)
3. US Open: 2004, 2005, 2006, 2007, 2008 (4 times)
4. French Open: 2009