Novak Djokovic, fresh from notching up a record-breaking 23rd Grand Slam title, moved back to the top of the ATP rankings released Monday, while Rafael Nadal dropped out of the top 100.
It was a 388th week as the world's No 1 for the 36-year old Djokovic, who jumped two places in the standings after his French Open victory.
He beat Spanish rival Carlos Alcaraz, 20, who had held the No 1 spot until the French Open, in the semi-final.
Russian Daniil Medvedev, who crashed out in the first round of Roland Garros, also dropped a place, while Norway's beaten finalist Casper Ruud stays in fourth, 40 points ahead of Greece's Stefanos Tsitsipas.
Fourteen-time French Open winner Nadal, however, paid the price for his absence through his long-term hip injury, dropping 121 places to 136th in the rankings.