Roger Federer is competing in Rotterdam this week seeking to become the oldest world No 1 men’s player at the age of 36.
Federer knows a semi-final berth at the Rotterdam Open will be enough to topple Rafael Nadal at the top of the rankings.
Federer lost the Rotterdam Open title way back in 2001, having first competed in Holland two years earlier, where he crashed out in the quarter-finals.
The Swiss star was a much more temperamental player back in his youth but evolved into the graceful, stylish tennis star we know today.
And he admits he has to work harder each year to prepare for matches.
“My warm-up now takes a lot longer and is much more professional than back then,” Federer said, reflecting on the first time he played in Rotterdam.
“In 1999 I jumped up and down a couple of times before the match, grabbed my racket and went on the court.
“Now – at this age – I start my warm-up one hour earlier.
“And now I’m tired when I finally get on the job!
“[Laughs] Well, maybe I exaggerate a bit.”
Federer will play Belgium’s Ruben Bemelmans in the first round of the 2018 Rotterdam Open on Wednesday.
He has won this tournament twice before, in 2005 and 2012.