Teenager Borna Coric completed an unlikely comeback for Croatia as the small Balkan nation beat the United States 3-2 in a Davis Cup quarter-final, in Oregon, late Sunday.

After losing the first two singles rubbers on Friday, Croatia kept alive their hopes by winning Saturday’s doubles before sweeping both reverse singles on the hardcourt in Portland.

Marin Cilic beat John Isner 7-6 6-3 6-4 in a battle of big servers to set up a deciding rubber between 19-year-old Coric and Jack Sock.

The 54th-ranked Coric prevailed 6-4 3-6 6-3 6-4.

“Our team just shows how much spirit we have, how much we’re motivated,” Cilic said in an on-courtinterview as Coric celebrated with a small but vocal section of Croatian fans.

“All the weekend we played amazing tennis and Borna produced unbelievable tennis (in) the deciding rubber.”

Croatia advanced to a home semi-final against France, while defending champions Britain will host Argentina in the other semi-final.

Britain needed to win only one of Sunday’s two reverse singles against Serbia in Belgrade, and Kyle Edmund wrapped up victory for the visitors with a rubber to spare when he beat Dusan Lajovic 6-3 6-4 7-6.

In the other quarter-finals, Argentina beat Italy 3-1 and France defeated the Czech Republic 3-1.

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