Leon Edwards knocked out Kamaru Usman with an insane head kick in the fifth and last round of their rematch to capture the welterweight title in the main event of UFC 278.

Paulo Costa beat Luke Rockhold in a thrilling back-and-forth slugfest and Merab Dvalishvili ground out a decision win over Jose Aldo at Vivint Arena in Salt Lake City.

Elsewhere on the card, there were wins for Tyson Pedro, Lucie Pudilova and Marcin Tybura, who defeated Harry Hunsucker, Wu Yanan and Aleksandar Romanov respectively.

Edwards looked like he was about to lose a decision before he laid Usman out flat on his back.

JUST IN: Leon Edwards dethrones Kamaru Usman with insane head kick KO

After the fight Edwards said: “You all said I couldn’t do it. Look at me now! Head shot, dead. That’s it. 

“It doesn’t matter from the trenches. I’m built like this. I go until the bell’s done. 

“Look at me now. I told you I could do it. Pound-for-pound, what? The belt belongs to nobody!

“I can’t explain it. God is on my side. I felt like this was my moment. 

“They all said I couldn’t come back and do it. Now look at me now. Champion of the world.”

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UFC 278 RESULTS

Main Card

Kamaru Usman vs Leon Edwards - Edwards def. Usman via KO (head kick) - Round 5, 4:04

Paulo Costa vs Luke Rockhold - Costa def. Rockhold via unanimous decision (30-27 x 3)

Jose Aldo vs Merab Dvalishvili - Dvalishvili def. Aldo via unanimous decision (29-28 x 2, 30-27)

Wu Yanan vs Lucie Pudilova - Pudilova def. Yanan via TKO (punches) - Round 2, 4:04

Tyson Pedro vs Harry Hunsucker - Pedro def. Hunsucker via TKO (punches) - Round 1, 1:05

UFC 278 Results: Kamaru Usman can tie Anderson Silva's record if he beats Leon Edwards

Prelims

Marcin Tybura vs Alexander Romanov - Tybura def. Romanov via majority decision (29-28, 29-28, 28-28)

Leonardo Santos vs Jared Gordon - Gordon def. Leonardo via unanimous decision (30-27, 30-27, 30-27)

Sean Woodson vs Luis Saldana - Woodson vs Saldana ruled a split draw (29-27, 27-29, 28-28)

AJ Fletcher vs Ange Loosa - Loosa def. Fletcher via unanimous decision (29-27, 29-28, 29-28)

Early Prelims

Amir Albazi vs Francisco Figueiredo - Albazi def. Figueiredo via submission (rear-naked choke) - Round 1, 4:34

Aoriqileng vs Jay Perrin - Aoriqileng def. Perrin via unanimous decision (29-28 x 3)

Victor Altamirano vs Daniel Lacerda - Altamirano def. Lacerda via TKO (punches) - Round 1, 3:39

Paulo Costa

UFC 278 FULL FIGHT CARD

Main Card

Kamaru Usman (c) vs. Leon Edwards - welterweight title fight

Paulo Costa vs. Luke Rockhold - middleweight bout

Jose Aldo vs. Merab Dvalishvili - bantamweight bout

Wu Yanan vs. Lucie Pudiolva - women's bantamweight bout

Tyson Pedro vs. Harry Hunsucker - light heavyweight bout

Preliminary Card

Marcin Tybura vs. Alexander Romanov - heavyweight bout

Leonardo Santos vs. Jared Gordon - lightweight bout

Sean Woodson vs. Luis Saldana - featherweight bout

AJ Fletcher vs. Ange Loosa - welterweight bout

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Early Prelims

Amir Albazi vs. Francisco Figueiredo - flyweight bout

Aoriqileng vs. Jay Perrin - bantamweight bout

Daniel Lacerda vs. Victor Altamirano - flyweight bout