(Reuters) - World number four Naomi Osaka showed no signs of fatigue as she powered past Belgium's Elise Mertens 6-4 6-1 in her second match of the day to reach the Pan Pacific Open final on Saturday.
Osaka was forced to double up after persistent showers had washed out her quarter-final against Yulia Putintseva on Friday and the top seed outclassed her Kazakh opponent 6-4 6-4 to advance to the semi-finals in Osaka, Japan.
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