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Rotterdam - Roger Federer became the oldest world number one on Friday when the 20-time Grand Slam title winner reached the semi-finals of the Rotterdam Open.
The 36-year-old Swiss overcame an early setback to beat Robin Haase of the Netherlands 4-6, 6-1, 6-1 and will replace old rival Rafael Nadal at the top of the rankings.
Federer surpasses Andre Agassi, who held the top spot aged 33 years and 131 days in 2003, as the oldest man to claim the world number one spot.
It is Federer's first time back at the summit since October 2012 having first claimed the top position in February 2004.
"Reaching number one is the ultimate achievement in tennis. When you're older you have to work double the amount, you have to wrestle it back from someone who's worked hard to get there. It's a dream come true," an emotional Federer said on court immediately after the match.
"It's been an amazing journey and to clinch it here, where I got my first wildcard in 1998, means so much."
Agassi was amongst the first to congratulate Federer.
"36 years 195 days... @rogerfederercontinues to raise the bar in our sport. Congratulations on yet another remarkable achievement!!," tweeted the American.
Federer had talked on Thursday of his desire to retake the world number one spot but doubted it would ever happen after he underwent knee surgery last year.
"I've struggled to try and get there. I had to win a lot of matches last year," said Federer, who was as low as 17 in the world in January 2017 before he returned to form with the Australian Open title.
"I never imagined this after my (February 2016) knee surgery. Number one is a tough place to get to.
"The most important thing is to be healthy, I would have had great regrets if I had not come here this week."
On Friday, Federer dropped his first set of the week against the aggressive Haase but regained control to ease to victory as the Dutchman struggled with a back injury.
The Swiss triumphed to the cheers of the fans in 79 minutes, ending with six aces.
Haase, the 30-year-old world number 42, finished on a disappointing note with his second double-fault on match point.
Second seed Grigor Dimitrov edged towards a possible first Rotterdam final as he dispatched young Russian Andrey Rublev 6-3, 6-4 to reach the semi-finals.
The Bulgarian duplicated his 2013 semi at the Ahoy Stadium with a win in an hour and a quarter, sending down a dozen aces and saving both break points he faced at the hands of his 20-year-old opponent.
Dimitrov edged ahead in the series, 2-1 as he put out the tournament debutant ranked 34th and holding one ATP title from last summer on clay in Umag.
Sixth seed Tomas Berdych withdrew prior to his quarter-final, with the Czech's absence putting fourth seed David Goffin into the semi-finals.
Berdych, the 2014 champion, has reportedly been ill for several days and was unable to compete.
Results at the ATP Rotterdam World Tennis tournament on Friday (x denotes seeding):
Quarter-finals
Roger Federer (SUI x1) bt Robin Haase (NED) 4-6, 6-1, 6-1
David Goffin (BEL x4) bt Tomas Berdych (CZE x6) - walkover
Grigor Dimitrov (BUL x2) bt Andrey Rublev (RUS) 6-3, 6-4
Factfile on Roger Federer who on Friday became the oldest man to claim the world number ranking:
Name: Roger Federer
Born: August 8, 1981
Birthplace: Basel, Switzerland
Age: 36
Turned pro: 1998
Weight: 187 lbs (85kg)
Height: 6ft 1in (1.85m)
Family: Married Mirka Vavrinec (2009). They have two sets of twins: Myla and Charlene (born 23 July 2009), and Leo and Lenny (born 6 May 2014).
Coaches: Ivan Ljubicic and Severin Luthi
Career
Titles: 96
Grand Slam titles: 20 (Australian Open 2004, 2006, 2007, 2010, 2017, 2018; French Open 2009; Wimbledon 2003, 2004, 2005, 2006, 2007, 2009, 2012, 2017; US Open 2004, 2005, 2006, 2007, 2008)
Davis Cup title: 2014
Olympics title: 2008 men's doubles in Beijing with Stan Wawrinka
ATP World Tour Finals titles: 2003, 2004, 2006, 2007, 2010, 2011
Prize money: $115,050,482 (as of Feb 12, 2018)
Match win/loss: Overall - 1142/250; Grand Slams 332/52
Five fast facts
+ Began playing tennis at age 8
+ Idols growing up were Stefan Edberg, Boris Becker and Pete Sampras
+ Served as ballboy at hometown tournament in Basel (1993-94) where he has gone on to win record eight titles
+ Speaks English, German, Swiss German, and French
+ Named top global athlete brand in 2016 and 2017 by Forbes Fab 40. Federer's brand value exceeds LeBron James, Cristiano Ronaldo, Tiger Woods and Neymar
36 years 195 days...@RogerFederer continues to raise the bar in our sport. Congratulations on yet another remarkable achievement!!
— Andre Agassi (@AndreAgassi) February 16, 2018
