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Michael Spinks Denies Larry Holmes His Marciano Moment

Michael Spinks shattered Larry Holmes’ pursuit of boxing history on September 21, 1985, taking a 15 round unanimous decision at the outdoor arena of the Michael Spinks Denies Larry Holmes His Marciano Moment @ Boxing News 24

Boxing News 24

Published: Monday, 21 September 2026 at 11:45 PM

Key Things to Know

Michael Spinks defeated Larry Holmes via a 15-round unanimous decision in Las Vegas.
The defeat prevented Larry Holmes from reaching a historic 49-0 undefeated record.
Spinks moved up from the light heavyweight division to claim the heavyweight title.

The Story in 60 Seconds

On September 21, 1985, Michael Spinks defeated Larry Holmes by a 15-round unanimous decision at the Riviera Hotel and Casino in Las Vegas. The victory prevented Holmes from matching Rocky Marciano's legendary 49-0 undefeated record and Joe Louis' division benchmark of 20 consecutive heavyweight title defenses.

Spinks, the reigning light heavyweight champion, successfully moved up to the heavyweight division at 200 pounds after a specialized conditioning program. He utilized superior agility, lateral movement, and late-round flurries to disrupt Holmes' famous left jab and secure the historic upset victory.

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Michael Spinks Denies Larry Holmes His Marciano Moment

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