sentences:  After a six-fight win streak in 2003 (5-0 in K-1) that included wins over multiple time K-1 champion Peter Aerts, heavyweight kickboxing champion Mike Bernardo, and K-1 World Grand Prix finalist Francisco Filho, the now top-ranked Leko was a favourite leading into the K-1 World Grand Prix 2003.With previous champion Ernesto Hoost out, Leko was considered a favourite leading in.However, he would leave K-1 prior to the finals, after contract negotiations broke down.