Roger Federer overpowered Grigor Dimitrov 6-2, 6-2 in less than an hour to win the ABN AMRO World Tournament for his 97th career title.
"Thank you very much for the great, great welcome I got this week".
Federer is now 12-0 this year and has won 25 of 26 matches since the US Open.
With Federer so swiftly on the front foot, it seemed only a matter of how long it would take him to put the match to bed, and a double fault from Dimitrov at 3-1 down as good as ended any hope of a comeback.
Dimitrov, Goffin advance to ATP Rotterdam semifinals
He is three years older than American Andre Agassi was when previously holding the record for oldest No 1 back in 2003. Federer's third title at the Rotterdam tournament comes a day before Federer officially returns to the top of the rankings, more than five years after he was last world No. 1. Federer has won a men's record 20 major singles titles - four more than second place Nadal and 12 more than the number that Connors won in his career.
The iconic Swiss star needed just 55 minutes to dispatch Dimitrov who looked to be under-cooked in the quickfire final.
"I was able to handle the pressure and today I played great from the beginning", he said. "I'm very, very happy". Anything can happen out there, all credit to Roger. He deserves to win the tournament and played unbelievable tennis the whole week.
Federer will now decide within a few days whether or not to travel to Dubai for the ATP event starting a week from Monday.
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