Nicholas Meregali is a 2x Brazilian Jiu Jitsu (BJJ) World Champion. He is well known for winning a gold medal in his first year as a black belt at the 2017 World Jiu-Jitsu Championship by beating Leandro Lo, one of the greatest BJJ competitors of all time, in the final. The next year, Meregali won a gold medal in the Super Heavyweight category at Brazilian National Jiu-Jitsu Championship submitting his opponent from the back in the final. In 2019, he won the national title again and added the open weight class title to earn "double gold." Meregali began training when he was 16 years old at the ACJJ academy in Santo Antônio. He was a prolific competitor at the coloured belts level winning the IBJJF worlds at both purple belt and brown belt. Meregali currently trains at the Alliance Jiu Jitsu academy in Porto Alegre under coach Mario Reis. In interviews he has described himself as a perfectionist. Nicholas has been described as having a "complete game," and he is known for his outstanding guard, especially his innovative use of the De La Riva position, and chokes from the back.