Top seeds Misaki Doi and Yanina Wickmayer were both unexpectedly beaten in the first round of the Sogyo Hashimoto Japan Women’s Open on Tuesday.
Japan's Doi was beaten in straight sets by unseeded Aliaksandra Sasnovich of Belarus 7-5, 6-3 in a match lasting one hour and 31 minutes, while second seed and defending champion Yanina Wickmayer of Belgium lost against unseeded Swiss, Viktorija Golubic, 6-1, 7-6(7).
In a first set dogged with seven breaks of serve, Doi was broken for the fourth time in the 11th game for Sasnovich to serve out the set 7-5.
In the second, the top seed dropped her serve in the third and ninth games to hand her opponent the set 6-3 and a second round meeting against American Alison Riske, who beat Nao Hibino of Japan 6-2, 6-4.
In an opening set lasting 38 minutes, Golubic cruised past second-seeded Wickmayer thanks to a total of five service breaks to claim the opening set 6-1.
The second was a closer affair with just two service breaks as things proceeded to a tie-break which the Swiss won 9-7, saving two set points, to progress to the next round.
In other first round action, Varvara Lepchenko of the US hammered Japan's Risa Ozaki 6-0, 6-2 and Kurumi Nara of Japan had few problems getting past Austria's Tamira Paszek 6-2, 6-2.
In another upset, Jana Cepelova of Slovakia beat American fifth seed Madison Brengle 6-1, 6-4 while sixth seed Zhang Shuai of China needed over two hours to get past Eri Hozumi of Japan 7-6(4), 1-6, 6-3.
In another upset, unseeded Louisa Chirico of the US beat Ukraine eighth seed Kateryna Bondarenko 6-4, 7-5 and fourth seed Johanna Larsson of Sweden cruised past Germany’s Sabine Lisicki 6-3, 6-2.