• London-born KSI real name Olajide "JJ" William Olatunji pioneered YouTube celebrity boxing matches after making a name for himself playing FIFA on the platform.
  • His first match with Logan Paul in August 2018 ended in a draw, and the pair will be fighting a re-match in LA on Saturday.

Here we go again.

KSI, the 26-year-old British YouTube star, is set to face off against controversial vlogger Logan Paul once again in a YouTube celebrity boxing match. The pair will battle it out on Saturday at the Staples Center in Los Angeles, which holds 21,000 people. And this time, they'll be classified as professional boxers.

YouTube boxing matches are a hot new trend, kickstarted by KSI. Although the British vlogger first made his name playing video games on YouTube, he's pioneered boxing events as a way to whip up famous YouTubers' huge followings. The real-life matches could generate millions of pounds in ticket, merchandise, and streaming sales.

Here's how KSI, real nameOlajide "JJ" William Olatunji, went from a suburban London upbringing to becoming one of the biggest YouTube stars in the world.

KSI was born in London, after his parents moved to the UK from Nigeria. "They would work their asses off," he told The Sun in an interview.

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KSI/YouTube

He eventually moved with his parents out to the suburbs of Watford and went to a fee-paying school. It would now cost you 20,000 ($26,000) a year to send your child to the "posh" Berkhamsted School.

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Despite the expensive education, KSI said he discovered YouTube from the age of about 15 and ended up failing his A-Levels. "Back then, people would be like: 'What are you doing? You're such a weirdo. Why are you making videos online?'" he told the Sun.

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He created his first YouTube channel in his early teens, the now-defunct "JideJunior." Almost all the videos feature KSI playing "FIFA 08," a theme that would continue in his main YouTube channel.

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Eventually, JJ would adopt the name "KSI", which stands for "Knowledge, Strength, Integrity."

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In 2010, KSI created his main channel and began posting game play footage from "FIFA 11." He began to amass a big following, and after just two years in he made enough money from YouTube ads and sponsorship to drop out of school.

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KSI teamed up with six other YouTube gamers to form a group of creators called The Sidemen. "A sideman is basically someone's bitch who just follows them around," said fellow Sidemen member Miniminter in an FAQ. "I was basically JJ's [KSI's] bitch that followed him around."

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The Sidemen brand and channel mostly revolved around the YouTubers playing video games and charity football matches with each other.

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The Sidemen would go on to live together in various plush houses in London. Their latest is a mansion at an undisclosed location in South London. It's thought that's where KSI lives.

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Out of all the Sidemen members, KSI has the biggest following with 20.5 million subscribers.

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He's a young millionaire, with estimated annual earnings of up to 1.5 million, according to SocialBlade.

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Asked about his wealth by TV presenter Piers Morgan, he said: "I'm doing alright."

KSI also branched out into music, posting "diss" tracks insulting other YouTubers - including his fellow Sidemen. The drama keeps viewers hooked.

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KSI's younger brother Deji is also on YouTube, posting under the name ComedyShortsGamer. The two often cross over into each other's channels.

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KSI and Deji's relationship sometimes grows turbulent. The brothers feuded on Twitter on Christmas after KSI was allegedly thrown out of their family home.

KSI has had some controversy. He was banned from a Eurogamer event and sponsor Microsoft dropped ties with him last year after he made sexist remarks to attendees. He subsequently apologised.

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KSI pioneered a new genre of crossover: The YouTube boxing match.

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His first fight was against Joe Weller, a YouTube creator on the same talent network (OP Talent).

The YouTube boxing match involves two famous personalities fighting each other just like a real match. KSI fought Weller in London's Copper Box Arena in 2017 and won the fight.

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Here's the full fight:

His most high profile fight to date was against Logan Paul in August 2018 at the 20,000 capacity Manchester Arena.

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The two whipped up anticipation for the fight in a bad-tempered press conference in London, in which KSI hurled insults at Paul's girlfriend and family.

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The fight was a majority draw, with two judges giving the YouTubers equal points and a third giving the edge to KSI.

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21,000 people packed out the stadium to watch the fight, and over 800,000 people watched it via YouTube's pay-per-view service.

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Business Insider calculated the match generated as much as $11 million in revenue .

KSI and Logan Paul's younger brothers, Deji and Jake Paul, also fought.

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Jake Paul won the match after five rounds.

The two organized a rematch, which is due to take place on Saturday in LA at 8 p.m.

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The second match is taking place in a more professional setting. Neither of the fighters will wear headgear, and both will be drug-tested.

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Both men have professional boxers' licenses.

The match is being promoted by Eddie Hearn, who has worked with boxing superstars like Anthony Joshua.

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KSI and Anthony Joshua occasionally train together. KSI told Behind the Gloves that Joshua advised him to "train hard, remain focused and be calm" ahead of the fight.

But KSI's main trainer is Jeff Mayweather, uncle of boxer Floyd Mayweather.

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The two YouTubers have been busily hyping up their fans for round two. In a press conference in September Paul mocked KSI's Christmas argument with his brother Deji and said he smelled "like herpes."

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Justin Bieber has expressed support for Logan Paul.

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KSI responded: "Bieber's an idiot for backing Logan Paul... If he is gonna be at the fight I'll be sure to lock eyes with him so he can see his boy knocked out." When asked if he'd ever fight Bieber he said: "No, that's stupid."

KSI said he's successful because he creates new trends. "When it came to diss tracks I found my way into that," he told Esquire. "Now with boxing, Ive created a new trend. Ive always adapted well, and thats whats led to my success."

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SEE ALSO: Logan Paul reveals his plans to become a professional boxer, release a music album, and try out TikTok in the future