World number two Iga Swiatek secured back-to-back wins to lead Poland into their first Billie Jean King Cup semi-finals with a comeback victory over the Czech Republic.

After Czech Marie Bouzkova won her singles opener against Magdalena Frech, it was up to Swiatek to keep Poland's hopes alive.

The five-time Grand Slam winner first beat Czech teenager Linda Noskova, who knocked her out of the Australian Open in January, 7-6 (7-4) 4-6 7-5 in a match that lasted two hours and 39 minutes.

Swiatek then returned to court with Katarzyna Kawa for a rare doubles encounter, with the pair sealing a 6-1 6-4 win against Katerina Siniakova and Bouzkova to book a place in the semi-finals.

"In 20 minutes I'll be dead," Swiatek joked afterwards.

"It was an exhausting day, but everything worked. We did a great job, we won."