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Wilton High sophomore Izzy Koziol advanced to the semifinals of the State Open girls tennis individual tournament with a pair of wins today at Yale University.

Koziol, the fifth seed, will face top-seeded Gabriella Dellacono of Stonington on Tuesday at 3, also at Yale.

She swept Olivia Foster of Staples in the round of 16, 6-0, 6-0, and ousted fourth-seeded Julia Migliorini of North Haven in a hard-fought quarterfinal, 6-4, 7-6.

In the opening rounds at Conard High School on Sunday, Koziol scored pro-set wins over Emma Kassis of Shepaug Valley, 8-0, and Samantha Cote of Fitch, 8-1.

Wilton’s number-two player, freshman Emma Caldwell, won her qualifying match on Sunday over Jordan Bonadies of Tolland, 8-1, before suffering a tough 8-6 loss to Maddie Massey of Joel Barlow in the first round.

The Warriors also had two doubles team qualify for the tournament.

Arden Lee and Amber Li, seeded 12th, advanced to the round of 16 with wins over Grace Florian and Carly Miceli of Lewis Mills, 8-2; and Sydney Donahue and Claire Vailionis of  Litchfield, 8-3. They lost in the third round to fifth-seeded Leah Polansky and Jia Yazon of South Windsor, 6-1, 6-0.

The team of Grace Cahill and Gerri Fox won its qualifying match by default over Brielle Fratoni Jaskiewicz and Phoebe Townsend of Stonington, before falling in the first round to third-seeded Hannah Bjorkman and Kristin Butler of Staples, 8-1.