15-year-old Jaden Ashman, from Essex, will split the prize with his Dutch partner Dave “Rojo” Jong after the pair came second in the first Fortnite World Cup.
They were narrowly beaten by Norwegian Emil Bergquist Pedersen and Austrian David W.
Jaden competed under the name Wolfiez at the three-day event held inside the Arthur Ashe tennis stadium in New York.
More than 100 finalists took part in the competitions, having been whittled down from around 40 aiming for the £2.4 million top prize.
Jaden told the BBC: “Me and my mum, we clash quite a lot. Like, she didn’t understand how it worked, so she thought that I was spending eight hours a day in my room just wasting my time.
“So now that I’ve proved to her that I can do stuff, I’m really happy.”
His mum Lisa added: “I think Jaden’s not really a materialistic person. He will have a lifetime supply of Uber Eats, and I think that will do him, to be fair.
“Just sitting there playing video games and eating takeaways, Jaden would be in his element.”
The online game has become a worldwide sensation, with more than 250 million players.
“He will have a lifetime supply of Uber Eats, and I think that will do him”
Jaden Ashman’s mum Lisa
However, Lisa nearly wrecked his son’s chances at reaching the final.
She said: If I’m honest with you I’ve been quite against him gaming. I’ve been more pushing him to his schoolwork.
“I’ve actually thrown an XBox out, snapped a headset, we’ve had a nightmare.
“And then leading up to the games, getting his visa, we had problems with that so we had a week of a nightmare.
“Then the dog ate his birth certificate, so – and this is not a joke – this actually really did happen.
“And then my work messed up my wages, so three things went wrong before we started heading here so I knew we were on an even keel and everything was going to go right.”
Another British teen is practising 12 hours a day in the hope of becoming Fortnite world champion.
Benjy Fish, 15, came 15th in the duos championship but still has high hopes of winning today’s solo tournament.