Novak Djokovic has returned to world No. 1 in the ATP rankings after claiming a record 23rd Grand Slam title at the French Open on Sunday.
The Serbian star rose from third in the previous May 29 rankings, while Yoshihito Nishioka moved up six places to a career-high 27th after a round-of-16 finish at Roland Garros.
Spain's Carlos Alcaraz and Russian Daniil Medvedev each moved down one spot to second and third, respectively.
Djokovic is starting his 388th week in the top spot.
Djokovic beat Norway's Casper Ruud 7-6 (7-1), 6-3, 7-5 in the final at Roland Garros on Sunday.
The Serbian is now the only male player to have won each of the four Grand Slams — Australian Open, French Open, Wimbledon and U.S. Open — at least three times.
Ruud, playing in his third major final after last year's French Open and the U.S. Open, got off to the better start with an early break.
Djokovic, however, rallied back to win the tiebreak, then cruised through the second set and tightened his grip when it mattered in the third.
The 36-year-old third seed sealed an emphatic win when Ruud sent a forehand wide on the second match point.
NFL legend Tom Brady watched from Djokovic's box, while soccer stars Kylian Mbappe and Zlatan Ibrahimovic sat side by side in the VIP area, which also accommodated former world heavyweight boxing champion Mike Tyson.