Prior to the Manchester Arena bout, both of the YouTube stars had already penned an agreement for a two-fight deal.
The duo fought to a controversial majority draw, meaning that KSI retained his “YouTube Championship Belt” after initially winning it against Brit rival Joe Weller.
After more than 18,000 people watched the first contest in Manchester and another 800,000 or so live, interest in seeing who would come out on top in the rematch has been high – and it’s officially on.
But who actually is KSI and how much does he earn?
Who is KSI?
KSI, real name Olajide William Olatunji, is a British YouTuber, musician, actor and now professional boxer.
He is 26-years-old and joined YouTube in June of 2009, he is a member of the Sidemen and his younger brother Deji is also a YouTuber who goes by the name of ComedyShortsGamer.
KSI has also been in two films, one called Laid in America, which he starred in alongside Caspar Lee and a documentary on his life and first fight with Paul titled Can’t Lose.
The Watford-born man has also released music of his own and is a rapper, with his highest charting song the infamous ‘Lamborghini’, which charted at No 30 in the UK.
How many YouTube subscribers does he have?
KSI is one of the most popular YouTubers in the world and boasts a stunning subscriber count of 20.5million, and has more than six billion views on the platform.
He started out by uploading videos of himself playing FIFA before moving on to more comedy based content, real life football and Q&A’s.
What’s his net worth?
While there is of course speculation online about this, there is no exact figure for how much KSI is worth – and it will change after his rematch with Paul.
KSI is a hugely popular and successful YouTuber but also earns a lot of his money from merchandise which he splits seven ways with the rest of the Sidemen, his music royalties and branding earnings. His net worth is now estimated to be £154 million .