In 2006, after his divorce and change of trainers, he came back to the "K-1 World Grand Prix 2006" finals. In his quarter-final match, he got a rematch against former foe Stefan Leko, who'd beaten him in 2002, and it turned into a grudge match. When Bonjasky was champion, Leko was taking a hiatus away from K-1, and his career rise had thus stalled. Prior to his rematch with Remy, he pledged that the 2006 Grand Prix would be his year to finally become the undisputed champion, at the expense of Bonjasky whom he'd beaten before. Bonjasky stated that Leko was 'limited'. In the fight, Bonjasky got hit in the groin twice in the first round and the fight was postponed for 30 minutes. When the bout resumed, Bonjasky still managed to win the fight by a unanimous decision, after scoring a knockdown in the final minute of the fight. However, because of a persisting injury to the groin, he was not able to continue the tournament and was replaced by Peter Aerts.