World No 7 Petra Kvitova will miss the opening day's action of her Czech team's Fed Cup final against the United States in Prague due to sickness.
It was the ideal start for the Czechs, winners of five of the last seven Fed Cup titles, who are without two of their top players.
Despite also losing their two best players just before the final, the Czechs proved their dominance in the women's team tournament this decade, leaning on the hustle of Siniakova.
· The USA is bidding to win eight consecutive Fed Cup ties for the first time since 1989-91.
Strycova and Fed Cup debutant Kenin earned two breaks each, with the more aggressive United States teenager taking the set in a tie-break.
Meanwhile, former French Open finalist Lucie Safarova, a four-time champion as part of the Czech side, announced she will retire after the Australian Open at the age of 31 having battled health problems in recent years.
Strycova took a 5-2 lead in the third and despite giving up two breaks, she took the set 6-4.
"For me it was a lot of emotions". I'm extremely happy that I won.
Making her debut in the competition, Kenin rose to the occasion and never seemed afraid of the roaring crowd. "I'm terribly proud of Katka, she's a fighter".
"In the second set I got a lot of break opportunities but she just played too good so credit to her".
In the second match, Siniakova cruised in the first set but fell behind in the second before pulling level at 3-3.
On the way to the final, the Czechs beat Switzerland 3-1 in the first round and Germany 4-1 in the semifinals. "The worst", said an emotional Siniakova.
"Actually, after the first point I was thinking, you know, you've played so many tie-breaks this year and you won nearly all". "We'll see what happens - we're prepared, we're ready to go". The Williams sisters, Sloane Stephens and Madison Keys all withdrew.
On Sunday, Siniakova is due to face Kenin and Strycova will then take on Riske.
Riske was selected ahead of Danielle Collins, who is ranked above her, but was unable to get the U.S. back on level terms against Siniakova.
"We need to discuss that".
"Despite everything, we're still the favorites because our girls are great players", Czech captain Petr Pala told reporters.