The Anteaters received the game-winning goal in the 54th minute, when Nikki Forrest's low corner kick just outside the goal line caromed off a Tigers defender and into the goal.
UOP (8-8-3) had pulled even on an own goal in the 28th minute when a free kick from near midfield off the foot of Brittni Beeman went to UCI defender Alyssa Humphrey about 10 yards in front of the left post. Humphrey leaped to head the ball, which glanced backward just under the crossbar and into the net.
UCI opened the scoring on another corner kick, as Forrest initiated with a drive to the far post. UCI defender Sarah Devine popped a header back toward the other post, onto the foot of junior defender CoCo Goodson, who punched it into the net in the17th minute.
Goodson, a transfer from Texas playing her first season at UCI, now has eight goals. Goodson also had the game-winner in the second overtime period in the Anteaters' 1-0 regular-season verdict against Pacific on Oct. 1 at UCI.
"That was certainly an equalizer to have an own goal on both teams," UCI Coach Scott Juniper said. "I thought the team played really well tonight. I thought [the Tigers] were fortunate to get their goal. This is the third Big West Tournament semifinal I've been in and these seniors have been in and it's the first one we've won.
"You come into the game 8-0 [in conference play, a Big West regular-season first] and you wonder to yourself 'How are we going to the team again?' But this is a team that loves to win and loves to compete for each other. It's one more win and that's how we treated it before the game. I think the last couple years, we treated it as a special game when we get to this point. But it was different this year. We have a different level of confidence and we treat it like any other game. This team has played like champions for most of the season and [it] did it again tonight."