ONE Championship is set to host ONE 173 at Denver's Ball Arena on August 1, 2025, featuring a major atomweight title unification bout. Promotion officials announced that the reigning atomweight champion, Stamp Fairtex, will face off against interim champion Denice Zamboanga. This marks ONE Championship's second event in Denver and its third in Colorado since its U.S. debut. Fairtex, a notable multi-sport champion, has not fought since September 2023 due to injuries, while Zamboanga has solidified her status by winning consecutive matches recently. The anticipation for this clash is high, especially with Fairtex’s returning fans eager to see her back in action.
ONE Championship will bring an exciting atomweight title unification fight to Denver on August 1, 2025, featuring champions Stamp Fairtex and Denice Zamboanga.
The August event will showcase the return of major star Stamp Fairtex, who has been sidelined due to injuries since September 2023, facing interim champion Zamboanga.
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