Seventh-seeded Alyssa Ahn of San Diego and 17th seeded Maya Iyengar of Paradise Valley, Ariz., will play Sunday for the singles title of the USTA Billie Jean Girls’ 18s National Championships.

Both won entertaining three-set semifinal matches on Saturday at Barnes Tennis Center.

Iyengar pulled off the upset of the day as she ousted second-seeded Julieta Pareja of Carlsbad 3-6, 6-4 7-6 (3) in two hours and 45 minutes before a large vocal crowd on Stadium Court.

After winning the first set, according to a tournament news release, Pareja, the number-one ranked junior in the world, took a 3-0 second-set lead and looked to be on her way to a straight-set victory.

However, the tide began to turn as Iyengar broke Pareja’s serve three times and won six of the next seven games to even the match

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