Madrid, Feb 19 (IANS): Switzerland's Roger Federer became the oldest ever World No. 1 in the men's Association of Tennis Professionals world singles rankings released on Monday after his victory at the Rotterdam Open.

Unseating Spain's Rafael Nadal, the 36-year-old reclaimed the top spot for the first time since October 29, 2012, reports Efe.

On Sunday, the 20-time Grand Slam champion defeated Grigor Dimitrov, who moved up to the fourth place, 6-2-6-2 in Rotterdam to win his 97th title.

Federer is three years older than previous record holder Andre Agassi of the United States.

Germany's Alexander Zverev fell to fifth place, while South Africa's Kevin Anderson jumped to ninth.

The current ATP rankings and point scores are as follows:

1. Roger Federer (Switzerland) 10,105

2. Rafael Nadal (Spain) 9,760 points

3. Marin Cilic (Croatia) 4,960

4. Grigor Dimitrov (Bulgaria) 4,635

5. Alexander Zverev (Germany) 4,450

6. Dominic Thiem (Austria) 4,220

7. David Goffin (Belgium) 3,280

8. Jack Sock (United States) 2,880

9. Kevin Anderson (South Africa) 2,825

10. Juan Martin del Potro (Argentina) 2,815.