"Largest sports media property in Asia’s history."
"Asia's largest global sports media company."
"Asia's largest martial arts organization."
"Asia's largest sports media company."
"Premier martial arts organization in Asia."

Weight Classes

Heavyweight: Over 225 lbs – 265 lbs
Light Heavyweight: Over 205 lbs – 225 lbs
Middleweight: Over 185 lbs – 205 lbs
Welterweight: Over 170 lbs – 185 lbs
Lightweight: Over 155 lbs – 170 lbs
Featherweight: Over 145 lbs – 155 lbs
Bantamweight: Over 135 lbs – 145 lbs
Flyweight: Over 125 lbs – 135 lbs
Strawweight: Over 115 lbs – 125 lbs
Atomweight: Over 105 lbs – 115 lbs


ONE Championship’s Hydration & Weigh-In System

ONE Championship’s weight classes are unlike any other organization in the world. ONE has been an industry leader by banning weight-cutting via dehydration. Instead, the promotion has implemented a revolutionary system that ensures athletes are hydrated, fit, and healthy ahead of their bouts.

The new program, which is the first of its kind for combat sports, is focused on athlete safety by introducing “walking weight” competition via multiple weigh-ins and hydration tests before and during event week. An athlete’s “walking weight” will be tracked on a regular basis throughout the period that the athlete is contracted to ONE.

The weigh-in program was established after thorough discussions and recommendations by ONE’s Medical and Competition teams, consisting of Vice President of Medical Services Dr. Warren Wang, Chief Medical Advisor Dr. James Okamoto, Senior Vice President of Competition Matt Hume, and Vice President Rich Franklin.

How Does ONE’s Hydration & Weigh-In System Work?
  • An athlete’s daily training weight is referred to as “walking weight.” ONE will assign an athlete his or her weight class based on the athlete’s “walking weight.” Bouts will be offered to an athlete strictly based on his or her “walking weight.”
  • When athletes arrive at ONE’s athlete hotel at the start of event week, their weights will be checked. Every athlete must be within the restrictions of the contracted weight class or catchweight limit.
  • During event week, all athletes will participate in a combined weigh-in and hydration test. Hydration will be checked through a urine specific gravity test in which every athlete will submit a urine sample to a medical technician. Under the guidance of ONE’s doctor, the technician and doctor will test the sample to ensure the athlete is hydrated with a urine specific gravity value of 1.025 or below. If the athlete passes this test, he or she can weigh-in. The athlete’s weight must be within the restrictions of the contracted weight class or catchweight limit.
  • On event day, athletes who made weight and passed the hydration test on the previous day do not have to weigh-in. However, if an athlete has missed weight or failed a hydration test, then he or she must pass the hydration test and make weight on event day.
  • If an athlete fails the hydration test on event day, he or she is not permitted to compete. Should an athlete pass the hydration test but weigh-in above the restrictions of the contracted weight class, then the bout may take place at a catchweight if the athlete is within 5 percent of his or her opponent’s official weight, and if the opponent agrees to competing at this catchweight. Additionally, a percentage of the athlete’s purse will be given to the opponent due to failure to make the contracted weight.
  • Post-bout weight may not exceed 5 percent over the weight class or catchweight limit. If an athlete were to commit this offense, he or she will be held to the rules below:
    • First offense – athlete receives an official warning.
    • Second offense – athlete will be penalized 25 percent of his or her total fight purse.
    • Third offense – athlete will be penalized 50 percent of his or her purse. The athlete will also be permanently disqualified from competing in the weight class and must move up to the next higher weight class.

Global Mixed Martial Arts Rule Set

Adriano Moraes grapples with Demetrious Johnson at ONE on Prime Video 1

ONE Championship uses the Global Mixed Martial Arts Rule Set, which blends a combination of best practices from Asian and Non-Asian rules in mixed martial arts. All athletes will wear 4-ounce mixed martial arts gloves in their bouts.  

Bout Duration

Each bout will be three rounds of five minutes per round, with a one-minute break between rounds. World Championship bouts will be five rounds of five minutes per round, with a one-minute break between rounds.

Ways To Win

A victory can be attained by:

  • Knockout
  • Technical knockout due to referee/doctor/corner stoppage
  • Submission
  • Technical submission due to referee/doctor/corner stoppage
  • Judges’ decision
  • Technical decision
  • Athlete verbally requests a stoppage
  • Disqualification
Decision Wins

In the event that a bout goes the distance, it will go to a judges’ decision. The three judges will score the bout in its entirety, not round-by-round. Judges will utilize the ONE judging criteria in descending order of importance to determine the winner of the bout.

ONE Judging Criteria
  • Near-knockout/near-submission
  • Damage (internal, accumulated, superficial)
  • Striking combinations and cage/ring generalship (ground control and superior positioning)
  • Earned takedowns or takedown defense
  • Aggression

Global Muay Thai Rule Set

Rodtang Jitmuangnon Jacob Smith ONE157 1920X1280 8

ONE Championship uses the Global Muay Thai Rule Set. All athletes will wear 4-ounce mixed martial arts gloves for bouts.

Bout Duration

Each bout will be three rounds of three minutes per round, with a one-minute break between rounds. World Championship bouts will be five rounds of three minutes per round, with a one-minute break between rounds.

Ways To Win

A victory can be attained by:

  • Knockout via punch, kick, knee, elbow, or legal throw
  • Technical knockout due to referee/doctor/corner stoppage
  • Technical knockout due to 3 knockdowns in a round/4 knockdowns in a bout
  • Athlete verbally requests a stoppage
  • Judges’ decision
  • Technical decision
  • Disqualification
Decision Wins

In the event a bout goes the distance, it will go to a judges’ decision. The three judges will score the bout round-by-round using the “10-Point-Must” system, and victory is awarded by the judges’ majority decision. If the points tally is equal, then the judges shall utilize the ONE Judging Criteria to determine a winner.

ONE Judging Criteria
  • Knockdowns
  • Damage (internal, accumulated, and superficial)
  • Number of clean strikes
  • Aggression and cage/ring generalship (superior positioning)

Global Kickboxing Rule Set

Superbon Singha Mawynn connects with a kick against Marat Grigorian during their Featherweight Kickboxing World Championship fight at ONE X

ONE Championship uses the Global Kickboxing Rule Set.

Athletes competing at bantamweight or lighter will wear 8-ounce boxing gloves. Athletes competing at featherweight or heavier will wear 10-ounce boxing gloves. 

Bout Duration

Each bout will be three rounds of three minutes per round, with a one-minute break between rounds. World Championship bouts will be five rounds of three minutes per round, with a one-minute break between rounds.

Ways To Win

A victory can be attained by:

  • Knockout via punch, kick, or knee
  • Technical knockout due to referee/doctor/corner stoppage
  • Technical knockout due to 3 knockdowns in a round/4 knockdowns in a bout
  • Athlete verbally requests a stoppage
  • Judges’ decision
  • Technical decision
  • Disqualification
Decision Wins

In the event a bout goes the distance, it will go to a judges’ decision. The three judges will score the bout round-by-round using the “10-Point-Must” system, and victory is awarded by the judges’ majority decision. If the points tally is equal, then the judges shall utilize the ONE Judging Criteria to determine a winner.

ONE Judging Criteria
  • Knockdowns
  • Damage (internal, accumulated, and superficial)
  • Number of clean strikes
  • Aggression and cage/ring generalship (superior positioning)

Global Submission Grappling Rule Set

Tye Ruotolo works to submit Garry Tonon at ONE 15

ONE Championship uses the Global Submission Grappling Rule Set.

Bout Duration

Every bout, including World Title bouts, will consist of a single 10-minute round.

Ways To Win

A victory is attained by one of the following ways:

  • Submission
  • Verbal tapout
  • Referee stoppage due to imminent danger
  • Athlete’s cornerman requests a stoppage
  • Judges’ decision
Decision Wins

In the event a bout goes the distance, it will go to a judges’ decision. The three judges will score the bout by the number of catches, or legitimate submission attempts. Judges will award the victory to the athlete with the greater number of catches. If there are an equal number of catches, the athlete who was awarded the last catch will earn the win. If there are no catches, the judges will award the victory to the athlete determined to have shown more aggression.

Athletes will receive a yellow card if he or she is stalling. If an athlete receives a yellow card, the only way that he or she can win is by submitting his or her opponent before the round ends. If both athletes receive a yellow card, the aforementioned decision rules apply.

ONE Judging Criteria
  • Number of catches
  • Aggression

Stay in the know

Take ONE Championship wherever you go! Sign up now to gain access to latest news, unlock special offers and get first access to the best seats to our live events.
By submitting this form, you are agreeing to our collection, use and disclosure of your information under our Privacy Policy. You may unsubscribe from these communications at any time.