Nottingham, Nottingham, UK, 12 June 2016 | AAP/AP

Ash Barty’s good run of form at the Aegon Open Nottingham has come to an end with the Queenslander going down narrowly 7-6(2) 7-6(7) to top-seeded Czech Karolina Pliskova in the quarterfinals.

Barty had two set points in the first set, was a break up in the second and then led 4-2 in the last tiebreaker but was unable to capitalise against her big-serving opponent who fired down 20 aces.

“I had enough chances in the first and second set – it’s disappointing not to convert. Karolina played the big points pretty well. I didn’t do a hell of a lot wrong until the second-set buster,” Barty said.

“It’s nice to know that straight off the bat that I can come in and compete with some of the best in the world which is really good.

“This week has just been a massive bonus for us. Being able to get so many matches against quality players has been good.”

Pliskova was to play fourth-seeded Monica Puig of Puerto Rico in the semifinals late Saturday. The quarter-finals were washed out on Friday.

Puig defeated Tamira Paszek of Austria 6-4 6-3 to reach her first semifinal since January in Sydney.

The other semi featured the unseeded Alison Riske of the United States against Saisai Zheng of China.

Riske, who won a minor tour event in Eastbourne last week, overcame Anett Kontaveit of Estonia 6-3 6-3 and Saisai beat the last local hope, qualifier Tara Moore 6-2 6-4.