Leona Maguire finished a superb tied fifth and twin sister Lisa joint 15th on their debuts for Duke University in collegiate golf in the US.
Leona closed with a four under 68 to finish tied fifth, just three strokes behind team mate Sandy Choi on eight under par in the Powerade Cougar Classic at Yeamans Hall in South Carolina.
Lisa was also in impressive form, carding a second consecutive 70 to share 15th on two under.
Duke moved up two spots to finish third in the final team standings behind Arkansas and UCLA.
The twins will be 20 on November 30.