Murthel Groenhart and Cedric Doumbe are two of the most accomplished and charismatic kickboxers in the welterweight division. They have faced each other three times in the ring, with Doumbe winning twice and Groenhart winning once. Their rivalry is marked by trash talk, controversy, and excitement.

The first fight between Groenhart and Doumbe took place at GLORY 28 in Paris on March 12, 2016. The fight was a co-main event, as it was a title eliminator for the GLORY welterweight championship. Doumbe was a relatively unknown fighter, who had only one fight in GLORY before, while Groenhart was a veteran and a former champion. The fight was a surprise, as Doumbe outsmarted and outscored Groenhart with his speed, movement, and combinations. Doumbe won by a unanimous decision, and earned a title shot against Nieky Holzken.

The second fight between Groenhart and Doumbe took place at GLORY 44 in Chicago on August 25, 2017. The fight was a main event, as it was a title fight for the GLORY welterweight championship. Doumbe had become the champion by defeating Holzken twice, while Groenhart had earned another title shot by winning the GLORY 42 contender tournament. The fight was a rematch, as both fighters wanted to prove who was the better man. Groenhart changed his strategy, as he was more aggressive and powerful, while Doumbe was more defensive and elusive. Groenhart won by a split decision, and became the new GLORY welterweight champion.

The third fight between Groenhart and Doumbe took place at GLORY 77 in Rotterdam on January 30, 2021. The fight was a main event, as it was a title fight for the undisputed GLORY welterweight championship. Doumbe had regained the title by defeating Alim Nabiyev and Harut Grigorian, while Groenhart had defended the title against Troy Jones and Mohammed Jaraya. The fight was a trilogy, as it was the final chapter of their epic saga. Doumbe ended the rivalry in spectacular fashion, as he knocked out Groenhart with a right overhand in the second round. Doumbe retained the undisputed GLORY welterweight championship, and became the first man to stop Groenhart in his professional career.