Roger Federer has confirmed his participation in the ABN AMRO World Tennis Tournament in Rotterdam next week, where he has the chance to become the oldest world No.1 in tennis.With Rafael Nadal set to return only at the end of February at Acapulco, Federer can overtake his old rival even if he manages to reach the semi-finals of the ATP 500 event.Currently, Federer is just 155 points behind Nadal in the second spot of the ATP rankings after he defended his Australian Open crown with a five-set thrilling victory over Croatia’s Marin Cilic.ALSO WATCHNadal, on the other hand, withdrew while playing the same opponent in the quarter-finals after facing trouble due to a hip injury.Federer will now look to overtake Andre Agassi’s record of the oldest men’s world No.1 since he achieved the feat aged 33 years and 131 days in 2003. If Federer indeed manages to surpass the record and become the oldest-ever world No.1, he will do so by more than three years of difference with Agassi.Federer termed Rotterdam as a special tournament and remembered that it was one of the first events he played at the top level. With Rotterdam celebrating its 45th edition, Federer was happy to join in.”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.”On the other hand, Tournament Director Richard Krajicek could not contain his excitement of having Federer as a last minute entry to the tournament. He has entered the tournament with an A+ wildcard, which each ATP 500 tournament has available for a select group of players for last-minute entries.advertisement”We are thrilled that Roger has chosen to come to the ABN AMRO World Tennis Tournament last minute. After his fantastic result at the Australian Open, it is tremendous news that he will be joining us in Rotterdam. It is a crown to the celebration of the history of our tournament.”The last twelve months have shown his tremendous drive. It makes perfect sense that he wants to capitalize on his current form. We are, of course, happy with this opportunity and see it as a crown on our 45th anniversary.”Despite Federer’s current form and dominance, the tournament has a tough players’ list. With players like Grigor Dimitrov, Alexander Zverev, David Goffin, Stan Wawrinka, Nick Kyrgios and defending champion Jo-Wilfried Tsonga in the mix, it is going to be anything but easy for Federer to reach the pinnacle he is looking for.