Knee Injury Forces Stamp Fairtex to Vacate ONE Championship Title

Stamp Fairtex, reigning ONE Championship women’s atomweight MMA champion, has officially vacated her title after failing to recover from a knee injury.

Title Fight Against Denice Zamboanga Cancelled

The long-awaited title unification clash against interim champion Denice Zamboanga — initially scheduled for ONE 173: Denver in August 2025 — has been cancelled, as Stamp’s rehabilitation did not progress as expected.

Organizational Changes Announced by ONE Championship

Following this development, ONE Championship confirmed two major updates:

• The Denver event is rescheduled for June 26, 2026, at Ball Arena

• Denice Zamboanga is now promoted to undisputed atomweight MMA champion

Chatri Sityodtong, Chairman and CEO of ONE Championship, expressed sympathy:

“We’re saddened to hear about Stamp’s injury setback and wish her the best in her recovery.”

U.S. Expansion Remains a Priority

Despite the cancellation, ONE Championship reiterated its commitment to expanding in the United States market, with the Denver card still a key part of its global growth strategy.