World Heavyweight Championship: Muhammad Ali vs. Chuck Wepner (1975) (movie): Muhammad Ali defended his title against challenger Chuck Wepner. The first four rounds were close as Ali apparently didn't take this fight seriously but the champion would finally score a 15th round knockout to silence his critics. Discover the latest Discussions, Reviews, Quotes, Theories, Explanations and Analysis of World Heavyweight Championship: Muhammad Ali vs. Chuck Wepner (1975) below