Ashleigh Barty’s US Open campaign is over with Australia’s last women’s singles hope falling to former finalist Karolina Pliskova in the fourth round.

The eighth-seeded Czech showed her class in a 6-4 6-4 victory over Barty despite being under pressure for much of the match.

Barty was unable to capitalise on any of eight break-point chances, while Pliskova converted both her chances to set up a quarter-final with either six-time champion Serena Williams or unseeded Estonian Kaia Kanepi.