Japan's four-division world champion Naoya Inoue remained second in the pound-for-pound ranking released by prestigious boxing magazine Ring.
The 30-year-old defeated champion Stephen Fulton of the United States in an eighth-round technical knockout in Tokyo last Tuesday to capture the WBC and WBO super bantamweight belts.
Inoue topped the ranking in June last year but was overtaken that August by Ukraine's heavyweight Oleksandr Usyk.
Usyk dropped to third in the latest rankings released Saturday, with welterweight Terence Crawford going to No. 1.
On Saturday, Crawford became the first undisputed champion in two weight divisions in boxing's four-belt era.