"I will definitely check out the new ranking on Monday morning to see whether I am really the new No 1".
Federer, the record 20-time Grand Slam victor, will reclaim the number one ranking he last held in October 2012 when the new ATP rankings are published on Monday.
Two other noteworthy achievements by Federer: The 14-plus years that have passed since he first ascended to No. 1 is also the most from initial to most recent stay there, and the five-plus years between stints atop the rankings is the longest such gap.
On the men's side of the game, eight-time Grand Slam victor Andre Agassi previously held the ranking record - he was 33 when he lost the number one spot in September 2003.
He entered the tournament as a wildcard and took advantage of Nadal's absence, who was the world No 1 until Federer won his quarter-final on Friday.
Asked to compare the 22-year-old Federer to the 36-year-old model, he said the older version had the edge.More news: Launch trailer released for Metal Gear Survive
Roger Federer shared an emotional tribute to all the coaches from over the years after reclaiming the numero uno position in the latest ATP rankings.
That was after he spent six months out recovering from an operation on a knee problem.
Federer first became world number one in February 2004, but has not topped the rankings since October 2012 and slipped to a low of 17th in January 2017.
"I think that everything is possible. But to be the No. 1, you have to win much and constantly, which becomes even tougher when you are older", said Luthi. I've done it for a longer period of time now, to hit through the ball off both wings harder. If I play well, good things will happen.