Probably Ali/Bob Foster in April of 1972. This was a move up in weight after his utter destruction of Rondon and Quarry{Mike}. He was knocked down 7 times and got ko in the 8th. Foster is one of my top 5 favorite fighters, and though not a huge event in boxing history, a fight I wish I could have attended. Plus Mills Lane was the ref, and he was a kool kat

If not then Ali/Foreman; nuff said.