Ronda Rousey recorded the fastest-ever finish in a UFC title fight as she submitted Cat Zingano after just 14 seconds in Los Angeles. Rousey was expected to face the toughest examination of her reign as bantamweight champion against the unbeaten Zingano. But having avoided a flying knee in the opening seconds, Rousey took her opponent down and set to work trying to execute her trademark armbar. Scroll down to watch Rousey beat Zingano in 14 seconds . Ronda Rousey manoeuvres herself into position to submit Cat Zingano after 14 seconds of their fight . Rousey attempts to lock in her trademark arm bar finish as she defended her bantamweight title . Rousey consoles Zingano after her stunning victory inside 14 seconds at the Staples Center in Los Angeles . Rousey grapples with Zingano before celebrating in the Octagon after her record-breaking victory . Ronda Rousey bt Cat Zingano via sub . Holly Holm bt Raquel Pennington via SD . Jake Ellenberger bt Josh Koscheck via sub . Alan Jouban bt Richard Walsh via KO . Tony Ferguson bt Gleison Tibau via sub . Roan Carneiro bt Mark Munoz via sub . Roman Salazar bt Norifumi Yamamoto N/C . Tim Means bt Dhiego Lima via TKO . Derrick Lewis bt Ruan Potts via TKO . Valmir Lazaro bt James Krause via SD . Masio Fullen bt Alexander Torres via SD . Rousey had landed on her head but the champion gracefully flipped Zingano on to her back, got up and manoeuvred swiftly into position to wrench Zingano's arm grotesquely. Rousey forced the challenger to tap out. 'We were expecting that she might come out and do something flying at me right away,' Rousey said. 'That's not usually how you land an armbar at that angle, but it works. It was a lot like judo transitions, where you scramble the second you hit the ground. 'I made that up on the fly, to be honest. But it was kind of funny: We were going toward the ground, and I kind of reverted back to judo mode and was thinking, 'Don't touch your back. It's a point.' 'That's where the acrobatic thing came from, was thinking about not touching your back in judo.' It was hard to work out who was more stunned, Zingano or the sell-out 17,000-crowd at the Staples Center. 'She's really good ... but that wouldn't happen again,' the beaten challenger said. 'It was a knee and then a throw and then a scramble, and then she was wrapped around my arm. I got caught. I was ready to do a million different things. I planned on getting in a fist fight tonight.' Zingano looks in pain as Rousey moves herself into position to execute the armbar finish . Rousey has won all 11 of her mixed martial arts fights and all but one inside the first round . Rousey celebrates as Zingano is attended to by the referee following her early defeat in Los Angeles . Dublin featherweight Conor McGregor (left) and light-heavyweight champion Jon Jones were in attendance . Former UFC heavyweight champion Brock Lesnar was Octagon side as Rousey eased to victory . For the first time in the promotion's history, two women's fights headlined a pay-per-view event as boxer Holly Holm made her debut with a split-decision victory over Raquel Pennington in the co-main event. Middleweight champion Chris Weidman originally was scheduled to fight Vitor Belfort but had to withdraw injured. Zingano had earned her title shot two years ago with an upset victory over Miesha Tate, but was forced to wait after suffering a serious knee injury before she was hit by her estranged husband's suicide last year. Holm, meanwhile, ended an 11-year pro boxing career to concentrate on MMA two years ago but looked far from the complete package against Pennington. Both fighters landed big shots during a stand-up fight, and while Holm finished with a bloody nose, she left Pennington with a swollen left eye. UFC Octagon girls Vanessa Hanson, Brittney Palmer, Arianny Celeste and Chrissy Blair pose for pictures . Vanessa and Brittney introduce the first round of the respective fights during UFC 184 in Los Angeles . Holly Holm (right) made a winning debut with a split-decision victory over Raquel Pennington . Holm moved from a boxing career to mixed martial arts and remains unbeaten . Pennington lands a left hand on Holm as she battled hard only to lose by split decision . Actresses Mandy Moore (left) and Minka Kelly pose for a photograph during the UFC 184 event . Vin Diesel was also at the Staples Center (left) as UFC president Dana White poses with Mark Wahlberg .
Ronda Rousey submitted Cat Zingano via armbar inside 14 seconds . Rousey made a successful fifth defence of her bantamweight title . The finish is fastest in a UFC title fight and joint-fastest of any UFC fight . Holly Holm beat Raquel Pennington by split decision on her debut .