Combat sport events in 2023
ONE Fight Night 13: Allazov vs. Grigorian was a combat sport event produced by ONE Championship that took place on August 5, 2023, at Lumpinee Boxing Stadium in Bangkok, Thailand.
Background.
A ONE Featherweight Kickboxing World Championship bout between current champion Chingiz Allazov and former Glory Lightweight champion Marat Grigorian headlined the event. The pair met for the first time at in 2013, but the fight ended in a no-contest due to an illegal elbow. Their second meeting took place in Levallois-Perret, France in 2014, where Grigorian won by unanimous decision.
A ONE Flyweight Submission Grappling World Championship bout between current champion Mikey Musumeci and current ONE Strawweight Champion Jarred Brooks served as the event's co-headliner.
A heavyweight bout between the multiple-time World IBJJF Jiu-Jitsu champion and ADCC submission fighting World champion Marcus Almeida and Oumar Kane took place at the event.
A featherweight kickboxing bout between the current ONE Featherweight Muay Thai Champion Tawanchai P.K.Saenchai and former Glory Lightweight Champion Davit Kiria took place at the event.
A bantamweight bout between former ONE Bantamweight Champion John Lineker and Kim Jae Woong took place at the event. 
A women's atomweight kickboxing bout between Supergirl Jaroonsak and Cristina Morales was expected to take place at the event. However, Morales had to withdraw from the bout after announcing her pregnancy and was replaced by Lara Fernandez.
A lightweight muay thai bout between Liam Nolan and Rungrawee Sitsongpeenong was scheduled for this event. However, Nolan withdrew due to injury and was replaced by Nauzet Trujillo.
At the weigh-ins, John Lineker, Elias Mahmoudi and Rungrawee Sitsongpeenong missed weight. Lineker weighed in at 151 pounds, 6 pounds over the bantamweight limit, Mahmoudi weighed in at 135.25 pounds, 0.25 pounds over the flyweight limit, and Rungrawee weighed in at 174 pounds, 4 pounds over the lightweight limit. All the bouts proceeded at catchweight with each being fined 25% his individual purse, which went to their opponents Kim Jae-woong, Edgar Tabares and Nauzet Trujillo respectively.
Bonus awards.
The following fighters received $50,000 bonuses. 
References.
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