You're looking for information on the "Fight Night Champion 1.02 patch". Here's what I could gather:
Restoration of One-Punch Knockouts
: A hallmark feature of the game, one-punch KOs were restored to active status, ensuring that any match could end instantly with a well-timed shot, mirroring the unpredictability of real boxing. Locomotion and Movement Balance :
Marcus looked at his gloves, at the threadbare label stitched inside that read simply: TRAIN. "Yeah," he said. "Cleaner."