The rubber had a few more twists and turns left, however, as Boulter mounted a monumental effort to rally back in the final set. Boulter powered ahead to a double break to lead 4-0, looking ready to charge through the finish line – but Putintseva had other ideas. She mounted a stunning comeback of her own to get both of the breaks back and level the score at 5-5.
With the stadium rocking, Putintseva found herself down match points at 6-5, but held firm to send the pair into a tiebreak. The tension rocketed when Boulter reached two more match points at 6-4 – but the Kazakh saved them as well to snatch the victory, 3-6, 6-2, 7-6(6).
The two sides will return to the Copper Box Arena tomorrow for the decisive rubbers, with Konta taking on Putintseva and Boulter scheduled to face Diyas in singles. In doubles, Harriet Dart and Heather Watson are set to face Anna Danilina and Galina Voskoboeva.