Naomi Osaka starts life as US Open champ with win, Garbine Muguruza dumped out

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Naomi Osaka celebrates

Naomi Osaka looked every bit the US Open champion as she beat Dominika Cibulkova in straight sets at the Pan Pacific Open.

Less than a fortnight after winning her maiden Grand Slam, the third-seeded Osaka breezed into the quarter-finals in Tokyo with a 6-2, 6-1 win over the Slovakian in an hour.

The 20-year-old raced into a 4-0 lead in the opening set after breaking twice and then won six games in a row in the second set to ease to victory.

Sixth seed Garbine Muguruza crashed out as the two-time Grand Slam winner suffered a 6-1, 6-2 drubbing at the hands of qualifier Alison Riske from the United States.

Next up for Riske is Karolina Pliskova after the fourth seed beat Daria Gavrilova from the Australia 4-6, 6-4, 6-4.

Meanwhile, second seed Caroline Garcia overcame a second-set slump against Anastasia Pavlyuchenkova, winning 6-4, 2-6, 7-5.

Top seed and two-time defending champion Caroline Wozniacki will kick off her campaign for a third title against Camila Giorgi on Thursday.

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