PRAGUE, Czech Republic - Katerina Siniakova secured her second singles win in the space of 24 hours to beat Sofia Kenin 7-5, 5-7, 7-5 in a rollercoaster singles rubber that wrapped up an 11th Fed Cup victory for the Czech Republic.
The match lasted three hours and 45 minutes, and resulted in wild celebrations for the hosts while the teenage American was consoled by her team-mates for her impressive efforts.
Siniakova had got off to a great start, breaking her opponent's serve at the first available opportunity.
The young American continued to battle, breaking back after a disputed call to prevent Siniakova serving it out, and closing the gap in the first set to trail 5-4 before the Czech got the vital break to take it 7-5.
Kenin pushed hard in the second set, breaking the Siniakova serve to take a 6-5 lead and give herself the chance to force a decider - which she took, serving it out 7-5.
Siniakova got off to a flier in the third, though, securing the early break again and consolidating it with a hold to take a 3-0 lead.
Kenin got on the board with a hold of serve before an epic fifth game, lasting 19 minutes, which saw Siniakova benefit from a net-cord before eventually managing to hold herself to move 4-1 ahead.
Kenin then won four games in a row to give herself the chance to serve it out - but Siniakova regrouped to get a break back, saving two match points in the process.
And it was the player with more experience who hit back in style, finally grabbing the win much to the delight of the noisy home crowd after almost four hours.
Siniakova had already beaten Alison Riske 6-3, 7-6(2) on Saturday after Barbora Strycova had opened up the weekend's action with a 6-7(5), 6-1, 6-4 win over Kenin.