Nelly Korda and Allisen Corpuz produced a 5 & 3 victory over England's Georgia Hall and France's Celine Boutier on Saturday morning, helping the U.S. maintain a 7-5 lead over the Europeans.
It was the second match won by Korda and Corpuz in two days.
Home favourite Carlota Ciganda had led from the front as she partnered Emily Pedersen to victory over Lilia Vu and Jennifer Kupcho in the opening foursomes at Finca Cortesin.
However, defeats for Anna Nordqvist and Leona Maguire, and Georgia Hall and Celine Boutier gave the visitors a 7-4 lead until Grant and Stark closed out their match with Danielle Kang and Andrea Lee in brilliant fashion.
Stark holed from 25 feet for birdie on the 17th to move one up and, with their opponents in close on the par-five 18th, Grant holed from 10 feet for birdie to seal the win.
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