Katie Boulter was knocked out of the Pan Pacific Open after being beaten in straight sets by Sofia Kenin in the semi-finals.

The British number one missed the chance to reach her third final of the year following a 6-4 6-4 loss to the 2020 Australian Open champion in Tokyo.

The American broke in the fifth and seventh games of the opener before Boulter pulled one break back and saved three set points, only for Kenin to serve out the set at the second attempt.

Kenin saved four break points in the sixth game of second set before immediately breaking Boulter in the seventh and went on to wrap up victory in one hour and 29 minutes.

Victory means the American will face either number one seed and Olympic champion Zheng Qinwen or sixth seed Diana Shnaider in the final.