Current heavyweight boxing champion Andy Ruiz Jr has lost a huge amount of weight ahead of his title defence against Anthony Joshua.

Ruiz stunned Joshua with a knockout victory in June to become the first Mexican to win a heavyweight world title, as he picked up the WBA, IBF, and WBO belts.

The rematch is set for Saudi Arabia on December 7.

Ruiz Jr posted a video and image on Instagram showing his dramatic weight loss before the fight.

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"I will arrive in better condition. Lighter, faster and more powerful," he told ESPN Deportes recently.

Ruiz Jr was a late call-up for the Joshua fight and went into the bout weighing in at 122kg, after previously fighting Joseph Parker at 116kg for his only other title fight.

A new look Andy Ruiz. Photo / Instagram
A new look Andy Ruiz. Photo / Instagram