Karolina Pliskova defeated Czech compatriot Petra Kvitova in straight sets to secure her place in the semi-finals of the WTA Finals in Singapore.

World number eight Pliskova, 26, won 6-3 6-4 for her first victory over Kvitova, 28, in four attempts.

It is the second successive year former world number one Pliskova has reached the semi-finals at the season-ending tournament.

“I cannot be more happy right now,” said seventh seed Pliskova.

“It was a good match and she’s a great player. She has always beaten me in the past but I knew I had a chance as I have been playing well.”

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