Rousey won the fight with her signature armbar lock, forcing Carano into submission just 17 seconds into the bout.

Mixed martial arts (MMA) star Ronda Rousey has retired again after demolishing fellow combat sports trailblazer Gina Carano in their long-awaited nontitle comeback bout in Los Angeles, defeating her rival by armbar after just 17 seconds.

After a hype-filled build-up, the bout on Saturday was a jarring anticlimax, with Rousey flooring Carano almost immediately before wrestling her into an armbar to end the fight.

American stars Rousey, 39, and Carano, 44, are widely regarded as two of the most prominent female fighters in MMA history, helping to take the sport into the mainstream during their fighting heydays more than a decade ago.

Carano had parlayed her success into a Hollywood career, appearing in several action movie roles, but had not fought since 2009 before her appearance in Saturday’s featherweight bout.

Rousey, a 2008 Olympics judo bronze medallist who subsequently found huge success in the Ultimate Fighting Championship (UFC), retired from the sport in 2016 after suffering back-to-back defeats against Amanda Nunes and Holly Holm.

The fighters were lured back into the cage for Saturday’s card at the Intuit Dome with the promise of a bumper payday that will reportedly see each fighter earn several million dollars from the streaming giant.

Rousey (13-2-0 MMA) secured her 10th submission win, returning to the cage following an exit from MMA in December 2016.

She insisted afterwards that her return to the ring was a one-off and ruled out the possibility of fighting again after paying tribute to Carano.

“Gina is the only person who could have brought me back into MMA – she’s my hero,” Rousey said. “She changed my world, and we changed the world, and I’ll never ever forget that or be able to pay that back enough.

“I’m so glad we finally got to share this moment.”

Asked about possibly extending her comeback, Rousey added, “There’s no way I could have ended it better than this. I want to have some more babies, got to get cooking.”

Carano (7-2-0 MMA) ⁠⁠had been inactive in the sport since August 2009, returning to MMA after a conversation last year at Rousey’s encouragement. She admitted the fight was too fast for her, regretting what ⁠⁠more she could have done in a short timeframe.

“I feel great,” Carano said after the loss. “I wanted to fight, ⁠⁠and I didn’t get that. But she trained. She ⁠⁠had her game plan. I have so much love and respect for her, and this was a victory in my life. She changed it. I woke up at 3am every morning thinking about ‌‌her. I fell back in love with mixed martial arts. There’s ‌‌so ‌‌many things to think about here. It’s just [that] the fight didn’t go my way.”

“I wanted that to last longer – I felt like I was so ready, I felt so good,” she said. “But I haven’t been here for 17 years. I wanted to hit her.”

Carano, 44, is unsure whether she’ll return to MMA, keeping the door open.

She said the mere fact of getting in shape for her return – she revealed before the bout she had shed more than 100 pounds (45kg) in the two years leading up to the contest – was a victory.

“Right now, just getting in the cage was a victory; getting here after 17 years is a victory. Fighting a legend was a victory. I feel great, I just wanted to fight, and I didn’t get to do that.”