Roger Federer will bid to replace Rafael Nadal as world number one when he competes in Rotterdam next week.
The 36-year-old Swiss won his sixth Australian Open title and 20th grand slam last month and reaching the semi-finals of the Rotterdam Open in Holland would return him to top spot in the ATP rankings.
He would also surpass Andre Agassi as the oldest ever world number one – the American was 33 when his sixth stint at the summit of men’s tennis ended in September 2003.
Federer, who won the event in 2005 and 2012, told his official website: “The tournament is special for me.
“I remember playing for the first time in 1999 as it was one of the first events where I got the chance to play at the highest level. It feels good to join in the celebrations of the 45th edition.”