The 24-year-old Chris Brown is allegedly being sued by a man who claims the rapper and his entourage beat him on a basketball court in July, reports TMZ.

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Malcolm Ausbon has filed court documents claiming the ‘Beautiful People’ star and his entourage hit him during a game at 24 Hour Fitness in north Los Angeles last summer.

The documents claim: ”When Ausbon expressed dissatisfaction with Brown’s behavior, Brown threatened to ‘kick his ass’ and ‘put these hands on you.’ Additionally, Brown claimed to be a member of the ‘Bloods’ a street gang engaged in criminal activity, not limited to murder, drugs, extortion and crime.”

The filing further claims he tried to leave the scene Chris and his security started to ”strike, punch, kick, pull and stomp Ausbon’s head and body,” resulting in him having to go to hospital.

Chris, 24, has been on probation since his 2009 assault of then-girlfriend Rihanna, which was revoked last December following a fight in Washington D.C.

TMZ has obtained a letter Ausbon’s lawyer sent to Chris’ legal eagle, Mark Geragos, demanding $250,000 from Chris … OR ELSE.  As for the “or else” …  the lawyer says if Brown doesn’t pay, “Mr. Ausbon is placed in a  position by the LAPD where he needs to decide whether he will press  charges.”

The lawyer continues, “He would rather be compensated.”

THAT, Mark Geragos tells TMZ, is EXTORTION … cleverly worded extortion, but extortion nonetheless.