On 9 October 2021 Brudenell took part in a 4-man tournament at Road to ONE: Muay Thai Grand Prix.
In the semifinals he defeated Alan Zomkowski by first-round knockout with a series of punches.
[4] Brudenell faced Sergej Maslobojev at KOK 117 Mega Series on 18 November 2023 in Vilnius, Lithuania.
[5] Brudenell successfully defended his KGP Heavyweight title at MTGP 86 on 23 March 2024, against Jakub Doman, defeating him by first-round knockout.
In the semifinals he defeated Samuele Pugliese by second-round knockout and in the final he knocked out Florin Ivănoaie to win the Grand Prix and qualify for the K-1 World Grand Prix 2024 Final.