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Japan Women's Open: No. 3 seed Yulia Putintseva retires due to injury

Anna Karolina Schmiedlova in action at the US Open where she lost in the first round to Yafan Wang of China. Photo by Sarah Stier/Getty Images

Anna Karolina Schmiedlova defeated No. 3 seed Yulia Putintseva in the first round of the Japan Women's Open after the world No. 55 retired due to a back injury.

Schmiedlova, the world No. 83, was a set up when the match was stopped in Hiroshima, with Putintseva halting play in the opening game of the second set.

The Slovakian, who was knocked out of the US Open in the first round last month, looked comfortable in the first set and won 6-2 in 48 minutes.

"I'm really, really happy that I won today because I didn't win any matches in a few weeks," Schmiedlova told the WTA website. "She had some problem with her back, probably, so it wasn't as I wanted it to be. But I'm very happy that I can play the second round here."

Elsewhere, China's Saisai Zheng defeated American Alison Riske 7-5 6-4 to also advance to the second round. The 7th seed broke Riske's serve to win the second set and win the match in just over an hour.

Japan's Misaki Doi lost to Viktorija Golubic, despite winning the first set 6-0. The Swiss player leveled by taking the second set 6-3 before winning 7-1 in a third-set tie break.

Lin Zhu beat Miyu Kato 7-6 (3) 6-2 while Luksika Kumkhum fought back from a set down to defeat Ying-Ying Duan 5-7 6-2 6-2

In the final match of the day, No. 5 seed Ajla Tomljanovic of Australia beat France's Fiona Ferro 6-4 6-1.