The longtime partners climbed from No. 2 to the top spot in this week's mixed doubles world rankings released by the Badminton World Federation.
The longtime doubles partners are No. 1 in the world rankings for the first time, becoming the first Japanese men to achieve the feat.
By winning the title at the Indonesia Masters, Momota set aside the disappointment of his Olympic performance in Tokyo and regained his mojo.
The WBA champion returns to the ring for the first time in two years against a successful, battle-tested opponent.