UFC 15: Collision Course was a mixed martial arts event held by the Ultimate Fighting Championship on October 17, 1997, in Bay St. Louis, Mississippi. The event was seen live on pay per view in the United States, and later released on home video

UFC 15: Collision Course

Pride 6 was a mixed martial arts event held by the Pride Fighting Championships. It took place at Yokohama Arena in Yokohama, Japan, on July 4, 1999. The first four matches were won by decision. The event also featured a karate match between Hiroki Kurosawa and Nobuaki Kakuda.