Swedish Muay Thai sensation Smilla Sundell has formally entered combined martial arts, signing with Tuff-N-Uff to make her skilled MMA debut in December 2025. The announcement marks a big chapter within the profession of the fighter generally known as “The Hurricane,” who beforehand held the ONE Ladies’s Strawweight Muay Thai World Championship and stands because the youngest individual to attain a world title in Muay Thai historical past.
Smilla Sundell To MMA
Sundell, currently 20 years old, will compete at 135 pounds in her debut, representing a weight class selection following her departure from ONE Championship. The choice to shift weight lessons exhibits bodily progress that occurred throughout her tenure with the Asia-based promotion.
At weigh-ins for her Could 2024 title protection in opposition to Natalia Diachkova, Sundell got here in 1.5 kilos over the strawweight restrict, leading to her being stripped of her championship regardless of profitable the bout by way of technical knockout within the second spherical. By August 2025, ONE Championship formally eliminated Sundell from their roster, citing her lack of ability to compete throughout the group’s accessible feminine weight classifications.
The fighter’s path to MMA prominence started by way of Muay Thai competition. Born in Stockholm, Sweden, on November 12, 2004, Sundell began martial arts coaching at age 5 with karate for self-defense functions. Her introduction to Muay Thai occurred throughout a household trip to Thailand when she was roughly 10 or 11 years outdated. What initially appeared like a brief curiosity reworked right into a everlasting profession course when her household relocated to Koh Samui.
Coaching at Fairtex Gymnasium in Pattaya from October 2019 onward, Sundell developed into an elite striker at an accelerated tempo. By January 2021, at simply 16 years outdated, she held the primary rating amongst feminine featherweights at 57.153 kilograms in line with the WBC Muay Thai. Her novice document earlier than becoming a member of ONE Championship included over 31 victories.
Sundell made her ONE Championship debut on February 25, 2022, at ONE: Full Circle, defeating Australia’s Diandra Martin by third-round TKO. Lower than two months later, she captured the inaugural ONE Ladies’s Strawweight Muay Thai World Championship by defeating Jackie Buntan by way of unanimous determination at ONE 156 on April 22, 2022. At 17 years and 5 months outdated, this victory established her because the youngest world champion in ONE Championship historical past, a distinction that prolonged throughout all weight lessons and martial arts disciplines throughout the group. The efficiency earned her a $50,000 Efficiency of the Night time bonus.
Sundell’s ONE Championship tenure included one successful title defense against Allycia Rodrigues on September 29, 2023, at ONE Battle Night time 14, securing one other technical knockout within the third spherical and a second $50,000 Efficiency of the Night time award. Her aggressive document inside ONE encompassed 5 victories throughout Muay Thai and kickboxing disciplines with out experiencing defeat earlier than her title protection in opposition to Diachkova, although the load administration points had change into more and more obvious.
Tuff-N-Uff, the promotion facilitating Sundell’s MMA entry, operates as the second-longest-running MMA organization in the United States, established in 1994. The promotion has developed and signed over 3,000 athletes throughout its 30-plus year history, with more than 60 fighters progressing to UFC contracts. Notable alumni include Hall-of-Famer Ronda Rousey, Women’s Bantamweight Champion Aspen Ladd, current UFC fighters Felicia Spencer and Tracy Cortez, and Khalil Rountree Jr. Tuff-N-Uff has consistently featured on UFC Fight Pass and received television coverage across multiple networks including ESPN, HBO, and specialty combat sports channels.
Sundell’s striking foundation provides a major advantage in distance management and clinch management, areas the place Muay Thai coaching straight transfers to MMA software. At 20 years outdated, Sundell enters the MMA panorama considerably youthful than many feminine fighters starting their skilled profession.
The particular December 2025 date and potential opponent stay unannounced as of the announcement date, although Sundell has indicated her readiness to start this chapter of her fight sports activities profession.
