Third baseman Toni Mascarenas drove in a run in the first with a double, two runs in the third with a double and hit her third home run of the season in the sixth for Arizona (7-0). UA had back-to-back homers by Kim Vandergeest and Allison Andrade earlier in that frame, plus added a solo shot by Finch in the seventh and a two-run blast by freshman pinch-hitter Jenny Gladding.
Finch had a no hitter until the seventh when she gave up two singles to LSU (1-1). She struck out six to improve to 2-0 on the year.
In tournament action Friday, Arizona beat Georgia 6-0 and Texas 14-0.
The Cats, who were to play No. 12 Nebraska at 5:30 p.m., have not given up a run or committed an error in their seven victories. UA closes out action in the tournament with a 10 a.m. game against No. 16 South Carolina and a noon contest against Missouri. Those games will be played at the Cave Creek Softball Complex in Phoenix, just east of I-17 north of Dunlap Road.