Waianae’s Rachael Ostovich suffered a third-round submission loss to Montana De La Rosa in a flyweight fight on the undercard of tonight’s The Ultimate Fighter Finale 27 event at the Pearl Theater in Las Vegas.

Hawaii finished 0-2 as Waiakea alumnus Brad Tavares was dominated by Israel Adesanya in the main event, losing by unanimous decision.

Two judges scored the contest 50-45 and the third had it 49-46 for Adesanya (14-0, 3-0 UFC), who was unranked at middleweight. Tavares, who was ranked No. 8, dropped to 18-6 overall and 12-5 in the UFC and saw his four-fight winning streak snapped.

Ostovich (4-4, 1-1 UFC) was at a severe reach disadvantage against the taller De La Rosa (9-4, 2-0) who has earned seven of her nine professional wins by submission.

Referee Mark Smith stopped the bout when Ostovich tapped to a rear-naked choke at 4 minutes, 21 seconds of the third round.

“I was planning on getting a submission,” De La Rosa said after the fight. “I thought it was going to be hard to stay on her back because she’s got such good back defense but that submission just presented itself. It was everything we game planned for in this fight and it couldn’t have gone better.”

Ostovich, a Moanalua alumna, landed her best strike of the night with a spinning back fist at the end of the second round, which was her best.

Two of the three judges gave Ostovich the second round and had the fight 19-19 going to the third. The third judge had De La Rosa ahead 20-18.