Thai ace will have to put on 4.5kg between his Muay Thai fights with Kongthoranee Sor Sommai next month and Jonathan Haggerty in September.
Champion Chingiz Allazov is not competing so winner is likely to earn a shot at title, held by Superbon Singha Mawynn.
Frenchwoman Grandjean will fight Zamboanga in a non-title fight in Bangkok on June 7 after atomweight MMA champion Stamp had to undergo knee surgery.
Thai star has torn meniscus, which means she is out of next two events, including a strawweight title fight with Xiong Jing Nan booked in for ONE 168.
The 17-year-old will take on Vietnam’s Trần Duy Nhất Nguyễn at ONE 167 next month, the second time he will feature on a live broadcast to North America.
Denis Puric and Rodtang Jitmuangnon will clash in flyweight contest next month, with Canadian looking to battle for belts ‘when I win’.
Veteran Thai flyweight’s fight against his impressive compatriot is a high-risk move as he gets ready to challenge bantamweight Jonathan Haggerty at ONE 168.
Thai fighter, previously Glory lightweight champion, has had his reputation dented by defeats, but aims to be in contention for the featherweight kickboxing belt.
The pair were scheduled to meet in April but the Canadian fell in and was stripped of his title, which he will be out to reclaim in Bangkok.
Petchtanong was the first champion to fall foul of the drug testing protocols, while Ramazanov is back after entering the ring and confronting Jonathan Haggerty at ONE Fight Night 16.
Kiko Cacella, the founder and head coach at D’Jago BJJ Academy, talks about growing up in Rio de Janeiro, discovering Brazilian jiu-jitsu, his short MMA career, and opening gyms in Hong Kong.
Lo threatened an upset, but was knocked down at the end of the second round to leave her with too much to do to come back.
Lo is already in Thailand and is training for the 110-pound bout at the Superbogn Gym in Bangkok, while Nongam is looking for a fifth successive victory.
The 26-year-old Kyrgyz says the economic difficulties of his country have helped produced hungry fighters with a winning mentality.
Chinese fighter Wei Rui was awarded unanimous decision win on his ONE debut, but promotion’s CEO Chatri Sityodtong says ‘cloud of controversy’ hangs over outcome.
Swedish fighter missed weight ahead of the bout, tipping the scales at 1.5lbs (0.68kg) over and so missed out on prize money of US$50,000.
The Swedish 19-year-old – who headlines Fight Night 22 – is growing in size, and ONE Championship does not currently have any female flyweights.
The 35-year-old, part of a three-man Chinese contingent at the ONE Championship event, still dreams of winning the lightweight title this year.
Buntan has been competing in this division for her entire professional career and previously fought while Meksen is moving up in weight.
The 34-year-old, who will appear in a bantamweight kickboxing contest at ONE Fight Night 22, has tasted just three defeats, the last one in 2018.
Their meeting on September 6, booked for the 18,000-capacity Ball Arena, will be ONE Championship’s second event in the US.