ONE Championship

Regian Eersel Stuns Lumpinee To Reclaim ONE Lightweight Kickboxing World Title

By LockerRoom Team April 22, 2026

Lumpinee Stadium bore witness to history on 10 April. ONE Friday Fights 150 and The Inner Circle shared a night that will be remembered for Regian "The Immortal" Eersel's masterful reclamation of the vacant ONE Lightweight Kickboxing World Title — a unanimous decision victory over Thailand's Rungrawee "Legatron" Sitsongpeenong that confirmed his status as a two-sport world champion.

He made it look easy. A head kick in the opening seconds set the tempo, and the Sityodtong Amsterdam star never relinquished it — threading punches through Rungrawee's guard, working snapping knees, and neutralising the Thai's kicking game with measured footwork. Round three brought the decisive moment: a combination that sent Rungrawee crashing to the canvas. The champion-in-waiting never looked back, dominating the championship rounds to finish 65-5.

The ONE Friday Fights 150 main event offered its own brand of excellence. Attachai Kelasport was precise, patient, and devastating — qualities that made his strawweight Muay Thai decision over Kompet Sitsarawatsuer feel inevitable once it was over.

Round by round, Attachai's lead kicks controlled the space while his right hand exploited every opening Kompet offered. A left high kick in round two sent Kompet stumbling to the ropes; Attachai swarmed instantly. Kompet survived on instinct and experience, but the judges awarded the young Kelasport fighter a unanimous decision — his 57th win and a statement to the entire division.

Rambong Sor Therapat rounded out the card with a majority decision over Pethuahin Jitmuangnon in a flyweight Muay Thai co-main event that asked hard questions of both men. Rambong had the answers — brutal body punching, relentless forward pressure, and the composure to withstand a fierce final-round assault from Pethuahin. Win number 83. A decade of ONE Championship victories. A fighter still very much in his prime.

The Inner Circle – 10 April Results:

  • Regian Eersel def. Rungrawee Sitsongpeenong via unanimous decision to claim the vacant ONE Lightweight Kickboxing World Championship
  • Isaac Mohammed def. Rittidet Lukjaoporongtom via KO (Muay Thai – strawweight)
  • Elies Abdelali def. Hicham Zerouali via TKO (Muay Thai – featherweight)
  • Logan Chan def. Kaokarat Sor Tienpo via KO (Muay Thai – bantamweight)
  • Kota Abe def. Hero Marco Manguray via KO (MMA – lightweight)

ONE Friday Fights 150 – 10 April Results:

  • Attachai Kelasport def. Kompet Sitsarawatsuer via unanimous decision (Muay Thai – strawweight)
  • Rambong Sor Therapat def. Pethuahin Jitmuangnon via majority decision (Muay Thai – flyweight)
  • Sornsueknoi FA Group def. Nuapet Torfunfarm via TKO (Muay Thai – flyweight)
  • Nassib Hmede def. Bartek Paszczyk via KO (Muay Thai – lightweight)
  • Dalian Dawody def. Dante Rodrigues via KO (Muay Thai – lightweight)
  • Chokdee Maxjandee def. Salai Htan Khee Shein via unanimous decision (Muay Thai – atomweight)
  • Rasul Rahimov def. Waldimir Britez via split decision (MMA – bantamweight)
  • Kazuteru Yamazaki def. Hong Chengzhi via KO (Kickboxing – flyweight)
  • Yoshida Kosei def. Huang Zhengbang via unanimous decision (Kickboxing – flyweight)