It all came down to this!
But there was an outright victor this time around with KSI - real name Olajide William Olatunji - getting the nod 56-55 (Paul), 57-54 (KSI), 56-55 (KSI) at the Staples Center in LA.
The two internet sensations fought to a majority draw in Manchester past year on KSI's home turf but the rematch is in Paul's home country America as they face in the Staples Centre on Saturday.
In the YouTubers first encounter they fought in Manchester with the result concluding in a majority draw, with the judges scoring the fight 57-58 in favour of KSI and the other two scoring it a 57-57, 57-57 draw. Their first match sold more than 1,000,000 PPV buys via YouTube, and it became the greatest amateur bout in the history of boxing.
The two already fought earlier, and the match ended in a draw.
Prior to the big night, Paul posted a photo of himself in his gear, writing, "Tonight my life begins".
After giving KSI time to recover, Reiss deemed that KSI was hit on the back of the head by Paul while he was down on the floor.
The social media sensations shared the ring once again at the Staples Centre, this time as qualified boxers, as Britain's KSI battled American Paul to settle their heated feud. "I definitely made him relevant outside of the United Kingdom, because before that, I don't think if you lived outside of the United Kingdom, you knew who he was". "He kept moving but I got him", KSI added. "I think it would be a little inhuman if I didn't feel any butterflies before, but now it's a calm confidence". And I'm not really guessing anymore. I'm going to work my arse off.
See more in the video below.