Get EA Access now and play 5 days early, before anyone else, starting January 25, 2018.
Pre-Order Champions Edition and get 3 Days Early Access:
Available February 2, 2018. The rules to Knockout Mode are simple. Both players start with the same amount of health but with each devastating shot landed the health bar decreases. Once you get your opponent down to one health bar get ready to Finish the Fight because the next shot you land will be a KO.
Source: XBOX YouTube