PRAGUE, Czech Republic — Katerina Siniakova won the first reverse singles on Sunday to lead the Czech Republic to its sixth Fed Cup title in eight years.

Siniakova saved two match points before defeating Sofia Kenin 7-5, 5-7, 7-5 to give the Czechs an insurmountable 3-0 lead over defending champion United States in the best-of-five final.

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."

In a hard-fought match at the O2 Arena, the 22-year-old Czech 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.

Siniakova wasted a 3-0 lead in the final set and the 19-year-old Kenin, who was playing her second match in her debut Fed Cup tie, fought back.

Kenin, who wasted three break points at 5-5, hit 43 winners but also made 76 unforced errors. Siniakova hit 24 winners.

"It was horrible, the worst (moment)," Siniakova said about the match points she faced. "But it's not the end until the final match point is converted."

At 3-0 down in the third set, Kenin needed treatment for what seemed to be a thigh muscle problem. The treatment was then repeated several times.

Trailing 3-1, the American wasted five break points in a game that took 19 minutes.

Siniakova hit a forehand winner to break Kenin for the fourth time in the 12th game to take the set.

On Saturday, Barbora Strycova rallied for a 6-7 (5), 6-1, 6-4 victory over Kenin to put the Czechs 1-0 ahead and Siniakova doubled the advantage with a 6-3, 7-6 (2) win over Alison Riske.

The U.S. is the most successful country in the international team competition and won its 18th Fed Cup title last year with Kathy Rinaldi in her first season as the captain. The U.S. had not previously won the Fed Cup since 2000.

On the way to the final, the Czechs beat Switzerland 3-1 in the first round and Germany 4-1 in the semifinals.

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