Most tennis fans in the United States were probably asleep during the Pan Pacific Open semifinal matches. The silver lining is the finals between Qinwen Zheng and Sofia Kenin will

Olympic champion Zheng Qinwen moved into the Tokyo final but her opponent Sofia Kenin was left sweating on her fitness after retiring from her doubles match on Saturday.

British number one Katie Boulter missed out on a place in the Pan Pacific Open final after a straight-set defeat by American wildcard Sofia Kenin in Saturday's semi-finals. The 28-year-old had been aiming to win her third title of the year but lost 6-4 6-4 in Tokyo in one hour and 30 minutes to the former world number four.