Flyweight finishers Antonio Cesar and Viet Anh Do will collide over three rounds on Dec. 18 to likely determine the next man in line for the ONE Championship flyweight belt in 2027, ONE confirmed to MMA Fighting.
ONE Fight Night 50 will take place at the Lumpinee Stadium in Bangkok, Thailand.
Cesar (15-2) enters the ring on a 10-fight winning streak with four finishes, including a first-round stoppage over Joshua Perreira this past October. Brazil’s “The Flash”, who is 22 years years old, is 4-0 already
in 2026 with three finishes and 2-0 since joining ONE in July.
Do (7-0) started his professional MMA career under the ONE banner in 2019 and enters the ring for the fourth time in 2026, stopping his previous three opponents. The 29-year-old Vietnamese flyweight has a 100 percent knockout rate in ONE, four of those inside the opening round.
The ONE flyweight title currently belongs to Avazbek Kholmirzaev, a 16-2 talent from Uzbekistan who beat seven opponents in a row over the past two years in ONE.
ONE Fight Night 50 is headlined by a grappling championship bout between Diogo Reis and Bebeto Oliveira. Check out the updated lineup below.
- Diogo Reis vs. Bebeto Oliveira — grappling
- Suablack Tor Pran49 vs. Jordan Estupinan — muay thai
- Bampara Kouyate vs. Ricardo Bravo — muay thai
- Maurice Abevi vs. Dzhabir Dzhabrailov — MMA
- Selina Flores vs. Kana — muay thai
- Antonio Cesar and Viet Anh Do — MMA
