The Czech Republic has been the dominant team in the Fed Cup in the last eight years or so, winning five of the last seven titles and looking good to add another one on Sunday after taking a 2-0 lead over the defending champions United States of America in front of the packed O2 Arena in Prague!
Chances are the two-time Wimbledon champion will not be needed, with the hosts requiring only one more win to put the match beyond their opponents.
The US are the most successful team in Fed Cup history with 18 titles so far, ahead of the Czechs who have won 10 including five as the former Czechoslovakia.
Riske went 3-1 up in the second set, but Siniakova levelled and took the set to a tie-break which she dominated to seal victory.
Petra Kvitova has been ruled out of the opening day of the Fed Cup final because of illness. Riske pushed the set to a tiebreak, where Siniakova took control.
With the Fed Cup crown on the line, Siniakova won an epic 7-5, 5-7, 7-5 marathon over Kenin to clinch the tie.
The Czech Republic kept its flawless record in the Fed Cup finals by capturing the trophy for the sixth time in eight years by defeating defending champion United States.
The USA can take comfort in their record against their opponents, having not lost to the Czechs in eight meetings dating back to 1985, while they are on a seven-match winning streak after beating Belarus in the final past year.
United States captain Kathy Rinaldi has made a decision to bench 36th-ranked Danielle Collins and go with Riske, who was on the USA team that won the title previous year.
"I hope I can use this experience", said the 22-year-old Siniakova.
"It couldn't be better but it isn't finished yet so we need to be ready for tomorrow". "I was just enjoying the moment and trying to play my game", Siniakova said. "I think I definitely do like the court a lot and any time that I'm indoors".
Siniakova and Barbora Krejcikova are then scheduled to face Danielle Collins and the Czech-born Nicole Melichar in the final doubles rubber.
The inexperienced U.S. team are without Serena and Venus Williams as well as Sloane Stephens and Madison Keys, while the hosts have Karolina Pliskova injured.
"I fought every ball and I'm so happy that I could win today in front of such a crowd".