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TST, Kings League, World Sevens, more: Who are these alternative soccer tournaments for?

Feeling more like a nightclub than Old Trafford, music bumped through speakers as former Manchester United midfielder Josh Harrop walked into a concert-like atmosphere in London's Copper Box Arena. The referee threw the ball into the air as an airhorn went off and social media influencers recorded the videos on their phones a few feet from the sideline.

Harrop, now a free agent, had only skimmed the rulebook for the Baller League before signing up, but he quickly realized that what he signed up for was nothing like the Premier League -- or anything he had played before.