The biggest star in the Ultimate Fighting Championship, the USA's Ronda Rousey, suffered a shock loss to compatriot Holly Holm in Melbourne.

Rousey was an unstoppable force in the sport, undefeated in 12 bouts before this, and has become one of the biggest sport stars in the US in particular because of her dominance.

This fight was brought forward two months so that it could take place in Australia to broaden her appeal.

Jimmy Pedro coached Rousey to her Olympic judo bronze medal in 2008 before she switched to mixed martial arts.

A former world judo champion and twice an Olympic bronze medallist, Pedro has been speaking to Sarah Mulkerrins about his shock at her first loss.

(Image: Ronda Rousey of the United States (R) and Holly Holm of the United States compete in their UFC women's bantamweight championship bout during the UFC 193 event at Etihad Stadium on November 15, 2015 in Melbourne, Australia. Credit: Quinn Rooney/Getty Images)