Sonny Liston vs. Floyd Patterson II was a professional boxing match contested on July 22, 1963, for the undisputed heavyweight championship.

The bout was postponed yet again and rescheduled for July 22 after Patterson had to have a benign tumour removed from between his fourth and fifth knuckles on his right hand.

[4] Although Patterson did manage to land a few more combinations than in the first bout, he was still unable to hold the champion off or significantly close the distance.

"[7] On August 21 the WBA voted to suspend any member state approving a contract with a return bout clause.

[8] The two fights with Patterson solidified Liston's longstanding reputation as the most intimidating man in the sport, and gave many fans and even writers the impression that he was a nearly unstoppable fighter.