Kopf, who now has four game-winning goals this season and shares the team lead with five goals, was opportunistic on her first tally and brilliant on her second.
She punched home a rebound of a Natalia Ledezma shot in the 22nd minute, as the ball ricocheted out of the grasp of Pilots goalkeeper Hailee DeYoung.
Kopf, whose speed, length and aggressiveness that borders on abandon make her a frequent blur across the landscape of any UCI run, used pace, touch and determination to double the advantage just more than four minutes into the second half.
Senior midfielder Judy Christopher drove a through ball from the back of the midfield circle onto a streaking Kopf's foot near the top of the box. Kopf, with a defender alongside, fielded the ball near knee level, brushing it forward, but taking just enough pace off to keep it from a charging DeYoung. Accelerating, she ran past the defender and poked the ball into the net just before DeYoung could close the gap.
"I just saw Lexi making a run and I know she's fast," said Christopher, who has four assists this season to lead the team, despite still helping anchor the defense at what Coach Scott Juniper calls the holding midfield spot. "I know if I give her a good ball through, she's going to get there."
UCI got back to its winning ways after an unexpected 2-1 loss to visiting Saint Mary's on Sunday. That defeat followed a 2-0 setback on Sept. 11 to then-No. 2-ranked Stanford, which has since claimed the No. 1 ranking.
UCI (6-2-1) had tied Santa Clara, 1-1, on Sept. 9, after opening the season with five straight wins.
"It was more of a wake-up call than anything," Christopher said of the Saint Mary's loss. "I think the loss was good for us, because we came back in practice and we were fired up. It was a very competitive week of practice and that gave us the edge [tonight]. We were just on it at practice."