ONE Championship will return to Denver, Colorado’s Ball Arena on August 1, 2025 for ONE 173, where an atomweight title unification fight will be featured.
Promotion officials announced the event on Thursday. ONE 173 will feature the return the return of Stamp Fairtex (11-2), the promotion’s atomweight champion who will take on interim champ Denice Zamboanga (12-2).
The event will mark ONE Championship’s second visit to Denver, and third overall to the state of Colorado, including ONE’s debut on U.S. soil in Broomfield in May 2023. They set up shop in Denver last year, while pulling out of a planned trip to Atlanta, GA.
Fairtex has long been one of the promotion’s biggest stars, earning multi-sport champ distinction after claiming gold in kickboxing, Muay Thai, and later MMA (she retains only the ONE atomweight MMA championship currently). Stamp was expected to Zamboanga last March, only for the bout to be pushed back to June, then scrapped due to an injury sustained by Fairtex.
A September fight against Xiong Jing Nan that would have seen Stamp challenge for the Chinese fighter’s strawweight title was scrapped due to injury as well.
As a result, Stamp Fairtex has not competed since September of 2023. During her absence, Zamboanga has won back-to-back bouts, and captured interim gold opposite Alyona Rassohyna last month.
