Thomas Hearns vs. Iran Barkley, billed as Knockout Nite, was a professional boxing match contested on June 6, 1988, for the WBC middleweight title.

[2] In his previous fight on October 29, 1987, Thomas Hearns had captured the middleweight title after knocking out Juan Roldán becoming the first four-division world champion in boxing history.

[3] Then on March 6, 1988, Iran Barkley beat Michael Olajide by technical knockout, becoming a top contender to WBC middleweight champion Thomas Hearns in the process.

However, in the final minute of the round, Hearns threw a left jab and then briefly dropped his hands as he attempted to move to his left when Barkley caught him flush with a powerful right hand and then landed another as Hearns fell to the canvas.

Referee Richard Steele would step in and stop the fight giving Barkley the victory at 2:39 of the round.