Ronda Rousey looked in great condition ahead of her bout with Amanda NunesCredit: Getty Images

Rousey is stepping back into the octagon for the first time since she was knocked out by Holly Holm 13 months ago.

But the former champion showed she is in better shape than her last bout with an Instagram post and thanked fans for their support.

She said: “Thank you everyone who came out to support at the weigh-ins today.

“Looking forward to proving you all right tomorrow. It’s going to be the happiest New Year ever. #FearTheReturn#FridayDec30 #ufc207 #rouseyvsnunes

Rousey goes into the fight with experts claiming she is destined to lose against Brazilian mixed martial artist Nunes.

The champ @Amanda_Leoa battles former champ @RondaRousey THIS FRIDAY at #UFC207! @Reebok pic.twitter.com/hKiO2NzDtC

— UFC (@ufc) December 29, 2016

The fight will be Ronda Rousey’s first clash since losing her title to Holly HolmCredit: Getty ImagesBut sources close to the American fighter claim she is feeling better than ever and is determined to get back to winning ways.

A source told E! News: “Ronda’s in the best shape of her life right now.

“She’s ready to go. She’s so focused and determined. Winning this means everything to her.”Nunes – who wore a lion mask at the weigh in – is not worried about her opponent and claims she will be ready for whatever is thrown at her.

Thanks for the nightmares, @Amanda_Leoa! 😳 #UFC207 pic.twitter.com/a1oqAekZVd

— UFC (@ufc) December 29, 2016

Amanda Nunes vs Ronda Rousey is set to start at 5.30am on Saturday morningCredit: AP:Associated PressNunes, 28, said: “I’m not sure how it’s going to be, but she could do a lot of things.

“Nobody knows, but I know I’m going to be ready. We will see about her.”

Rousey is continuing her media blackout ahead of the fight and UFC president Dana White admits the situation is less than ideal for the company.

White said: “It’s definitely not ideal. It’s what she asked for.”

Nunes and Rousey will go to battle at around 5.30am on Saturday at the T-Mobile Arena in Las Vegas.