Vancouver-based Bibiano (The Flash) Fernandes will defend his One Championship bantamweight title against featherweight and lightweight champion Martin (The Situ-Asian) Nguyen.
The two will face off in the main event of the "One: Iron Will" card scheduled for March 24 at the Impact Arena in Bangkok.
Nguyen (10-1-0) is bidding to hold titles at 135, 145 and 155 pounds.
Standing in his way is the 37-year-old Fernandes. The Brazilian-born 135-pounder has not lost since December 2010, winning 13 straight including 10 in a row in the One Championship.
Fernandes (21-3-0) won the bantamweight world title in 2013, defending it six times. Last time out he submitted American Andrew Leone in the first round.
The 28-year-old Nguyen was born and raised in Sydney, Australia, to refugee parents who fled Vietnam by way of Malaysia and Indonesia.