United Kingdom, Sept. 15 -- Stormzy scooped £15,000 at a Las Vegas casino last weekend.

The British rapper, 33, flew out to Sin City to watch his pro boxer pal Conor Benn take on Ryan Garcia in a world title fight.

While Benn lost to Garcia in a brutal second-round technical knockout, Stormzy went the distance at the Wynn Resorts Casino by landing a £15,000 knockout blow against the house.

A source told The Sun newspaper's Bizarre column: "Stormzy won big at the casino before the fight and couldn't believe his luck.

"There were loads of people gathering around to see the commotion.

"Someone said he ended up walking away with £15,000 - which isn't bad for a quick flutter."

Following the Vossi Bop hitmaker's huge windfa...