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A Los Angeles Lakers fan is suing LeBron James ... alleging the NBA superstar duped him with "The Second Decision" -- and cost him hundreds of dollars.

Andrew Garcia , a 29-year-old, lifelong Lakers fan, filed the lawsuit in a small claims court in Los Angeles County on Wednesday ... claiming James owes him $865.66 after he says the hooper seemingly intimated he was about to announce his retirement.

Garcia tells TMZ Sports ... when James on Monday teased he had a big choice to make -- he figured The King meant he was hanging up his sneakers, so he raced to Ticketmaster to score some seats to what would be LBJ's last-ever matchup with his former team, the Cleveland Cavaliers.

Garcia purchased two tix for the March 31, 2026 date for $432.83 apiece .

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