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 , 'Do n'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 would n'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 . The UFC has been criticized for its handling of the incident, with many fans calling it a "rigged" fight. 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 .