As far as Cosell doing boxing on radio, there was an aircheck site (that sadly didn't last too long) called "It Was Classic" that specialized in a lot of unusual airchecks including some really rare stuff like a Boston area high school football game from the late 40s. They had the pre-fight show carried on WABC from (I think) a Floyd Patterson-Ingemar Johanssen title fight from the summer of 1960 at Yankee Stadium. A guy named Les Keiter was the PBP announcer, and Cosell did color commentary, including pointing out some of the celebrities in the crowd. Has to be one of the earliest recordings of Hawahd out there. Back to Ali, I do remember some of his 70's bouts being on closed-circuit TV at the Memorial Coliseum in Fort Wayne. ABC showed at least one of his fights in the 70s in prime time a few weeks after the fact.