It was Vandeweghe 's first win over Petkovic ; Petkovic had won the last three meetings .
Vandeweghe clinched the tie for the U.S. with a 3 - 6 , 6 - 4 , 6 - 0 , win over Petkovic .
U.S. was Vandeweghe 's first win over Petkovic ; Petkovic had won the last three meetings .
Vandeweghe clinched the tie for the U.S. with a 3 - 6 , 6 - 4 , 6 - 0 , win over Petkovic .