PRAGUE — Six finals, six victories.

The Czech Republic kept its perfect record in the Fed Cup finals by capturing the trophy for the sixth time in eight years by defeating defending champion United States.

Katerina Siniakova saved two match points before defeating Sofia Kenin 7-5, 5-7, 7-5 in the first reverse singles on Sunday to give the Czechs an insurmountable 3-0 lead over defending champion United States in the best-of-five final. The remaining two matches were not played.

It was the first victory for the Czechs over the United States — since the country was created after the split of Czechoslovakia in 1993 — after four defeats in the Fed Cup.

The Czechoslovakia team that won five Fed Cup titles was 2-6 against the U.S.

"It was an unbelievable match for me," Siniakova said. "It was up and down, with nerves. I'm extremely happy that I won. I thank all who came for their support. It was felt." U.S. captain Kathy Rinaldi said she was proud of her team despite the loss.

"We didn't get the result that we wanted but nobody can say we didn't give all out there," Rinaldi said after her first loss as the captain.

"That match today, both girls, both players were incredible," she said. "I'm so honored to have been part of that match, they really fought hard, the points were incredible, it's just something I never forget." In a hard-fought match at the O2 Arena, the 22-year-old Siniakova saved two match points when Kenin was serving at 5-4, and went on to convert her second match point on the indoor hardcourt in front of 14,500 fans.