Lyle Alzado
The late, great Alzado was one of the most fearsome NFL players of his day. He represented the Raiders with pride and developed an intimidating persona. That’s also why he ended up fighting in one of the first iconic celebrity boxing matches when he faced Muhammad Ali.

They met in Mile High City, Denver, in an eight-round exhibition. Ali was past his best at the time but he still schooled Alzado. This fight inspired some of the freak shows that happened in the 21st century. Perhaps that’s not the legacy that either of these two legends wanted (via Denver Post).