| Singles | |
|---|---|
| 2018 Japan Women's Open | |
| Champion |  Hsieh Su-wei |
| Runner-up |  Amanda Anisimova |
| Final score | 6–2, 6–2 |
Zarina Diyas was the defending champion, but lost in the quarterfinals to Zhang Shuai.
Hsieh Su-wei won her first title in six years, beating Amanda Anisimova in the final 6–2, 6–2.
Zhang Shuai (semifinals) Hsieh Su-wei (champion)
Yulia Putintseva (first round, retired) Wang Qiang (semifinals)
Ajla Tomljanović (quarterfinals) Zarina Diyas (quarterfinals) Zheng Saisai (second round)
Magda Linette (quarterfinals)| Semifinals | Final | ||||||||||||
| 1 | Zhang Shuai | 64 | 5 | ||||||||||
| Q | Amanda Anisimova | 77 | 7 | ||||||||||
| Q | Amanda Anisimova | 2 | 2 | ||||||||||
| 2 | Hsieh Su-wei | 6 | 6 | ||||||||||
| 4 | Wang Qiang | 4 | 4 | ||||||||||
| 2 | Hsieh Su-wei | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | S Zhang | 7 | 6 | ||||||||||||||||||||||||
| M Fręch | 5 | 3 | 1 | S Zhang | 6 | 77 | |||||||||||||||||||||
| WC |  N Hibino | 6 | 6 | WC | N Hibino | 4 | 64 | ||||||||||||||||||||
 E Bouchard | 4 | 4 | 1 | S Zhang | 6 | 7 | |||||||||||||||||||||
 K Kozlova | 6 | 6 | 6 | Z Diyas | 4 | 5 | |||||||||||||||||||||
| Q | Y Zhang | 2 | 3 | K Kozlova | 77 | 2 | 5 | ||||||||||||||||||||
 S Sorribes Tormo | 2 | 1 | 6 | Z Diyas | 63 | 6 | 7 | ||||||||||||||||||||
| 6 | Z Diyas | 6 | 6 | 1 | S Zhang | 64 | 5 | ||||||||||||||||||||
| 3 | Y Putintseva | 2 | 0r | Q | A Anisimova | 77 | 7 | ||||||||||||||||||||
 AK Schmiedlová | 6 | 0 | AK Schmiedlová | 5 | 7 | 6 | |||||||||||||||||||||
 V Golubic | 0 | 6 | 77 | V Golubic | 7 | 5 | 3 | ||||||||||||||||||||
| WC | M Doi | 6 | 3 | 61 | AK Schmiedlová | 3 | 1 | ||||||||||||||||||||
 J Fett | 1 | 1 | Q | A Anisimova | 6 | 6 | |||||||||||||||||||||
| Q | A Anisimova | 6 | 6 | Q | A Anisimova | 6 | 6 | ||||||||||||||||||||
| A Riske | 5 | 4 | 7 | S Zheng | 1 | 1 | |||||||||||||||||||||
| 7 | S Zheng | 7 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | M Linette | 6 | 6 | ||||||||||||||||||||||||
 J Larsson | 4 | 1 | 8 | M Linette | 6 | 77 | |||||||||||||||||||||
 T Zidanšek | 6 | 6 | T Zidanšek | 3 | 63 | ||||||||||||||||||||||
| Q | Ar Rodionova | 2 | 4 | 8 | M Linette | 2 | 2 | ||||||||||||||||||||
| Y Duan | 7 | 2 | 2 | 4 | Q Wang | 6 | 6 | ||||||||||||||||||||
 L Kumkhum | 5 | 6 | 6 | L Kumkhum | 5 | 3 | |||||||||||||||||||||
| Q | P Hon | 6 | 1 | 3 | 4 | Q Wang | 7 | 6 | |||||||||||||||||||
| 4 | Q Wang | 3 | 6 | 6 | 4 | Q Wang | 4 | 4 | |||||||||||||||||||
| 5 | A Tomljanović | 6 | 6 | 2 | S-w Hsieh | 6 | 6 | ||||||||||||||||||||
 F Ferro | 4 | 1 | 5 | A Tomljanović | 7 | 6 | |||||||||||||||||||||
| WC | M Kato | 63 | 2 | L Zhu | 5 | 4 | |||||||||||||||||||||
| L Zhu | 77 | 6 | 5 | A Tomljanović | 6 | 2 | 0 | ||||||||||||||||||||
| PR |  M Minella | 6 | 6 | 2 | S-w Hsieh | 4 | 6 | 6 | |||||||||||||||||||
| K Nara | 3 | 4 | PR | M Minella | 3 | 2 | |||||||||||||||||||||
| P Hercog | 6 | 1 | 3 | 2 | S-w Hsieh | 6 | 6 | ||||||||||||||||||||
| 2 | S-w Hsieh | 4 | 6 | 6 | |||||||||||||||||||||||
Amanda Anisimova (qualified)
Antonia Lottner (first round) Arina Rodionova (qualified) Han Xinyun (second round)
Harriet Dart (second round)
Danka Kovinić (first round) Priscilla Hon (qualified)
Jang Su-jeong (qualifying competition)| First round | Second round | Qualifying competition | ||||||||||||||||||
| 1 | Amanda Anisimova | 6 | 6 | |||||||||||||||||
| Momoko Kobori | 3 | 3 | ||||||||||||||||||
| 1 | Amanda Anisimova | 6 | 3 | 6 | ||||||||||||||||
| WC | Urszula Radwańska | 1 | 6 | 4 | ||||||||||||||||
| WC | Urszula Radwańska | 79 | 6 | |||||||||||||||||
| Miharu Imanishi | 67 | 1 | ||||||||||||||||||
| 1 | Amanda Anisimova | 6 | 6 | |||||||||||||||||
| Alt | Hiroko Kuwata | 3 | 2 | |||||||||||||||||
| Alt | Hiroko Kuwata | 6 | 63 | 6 | ||||||||||||||||
| Mai Minokoshi | 1 | 77 | 3 | |||||||||||||||||
| Alt | Hiroko Kuwata | 6 | 7 | |||||||||||||||||
| 5 | Harriet Dart | 4 | 5 | |||||||||||||||||
| WC | Makoto Ninomiya | 2 | 77 | 2 | ||||||||||||||||
| 5 | Harriet Dart | 6 | 65 | 6 | ||||||||||||||||
| First round | Second round | Qualifying competition | ||||||||||||||||||
| 2 | Antonia Lottner | 3 | 4 | |||||||||||||||||
| Zhang Yuxuan | 6 | 6 | ||||||||||||||||||
| Zhang Yuxuan | 6 | 7 | ||||||||||||||||||
 Valeria Savinykh | 3 | 5 | ||||||||||||||||||
| Zhang Kailin | 3 | 7 | 4 | |||||||||||||||||
| Valeria Savinykh | 6 | 5 | 6 | |||||||||||||||||
| Zhang Yuxuan | 4 | 6 | 6 | |||||||||||||||||
| 8 | Jang Su-jeong | 6 | 3 | 1 | ||||||||||||||||
| Junri Namigata | 2 | 3 | ||||||||||||||||||
| Danielle Lao | 6 | 6 | ||||||||||||||||||
| Danielle Lao | 5 | 3 | ||||||||||||||||||
| 8 | Jang Su-jeong | 7 | 6 | |||||||||||||||||
| Ellen Perez | 6 | 3 | 3 | |||||||||||||||||
| 8 | Jang Su-jeong | 3 | 6 | 6 | ||||||||||||||||
| First round | Second round | Qualifying competition | ||||||||||||||||||
| 3 | Arina Rodionova | 6 | 0 | |||||||||||||||||
| Eri Hozumi | 0 | 0r | ||||||||||||||||||
| 3 | Arina Rodionova | 3 | 6 | 7 | ||||||||||||||||
| WC | Chihiro Muramatsu | 6 | 4 | 5 | ||||||||||||||||
| Risa Ozaki | 4 | 6 | 3 | |||||||||||||||||
| WC | Chihiro Muramatsu | 6 | 3 | 6 | ||||||||||||||||
| 3 | Arina Rodionova | 3 | 6 | 6 | ||||||||||||||||
| Sílvia Soler Espinosa | 6 | 2 | 3 | |||||||||||||||||
| Anna Zaja | 6 | 6 | ||||||||||||||||||
 Dejana Radanović | 4 | 3 | ||||||||||||||||||
| Anna Zaja | 3 | 4 | ||||||||||||||||||
| Sílvia Soler Espinosa | 6 | 6 | ||||||||||||||||||
| Sílvia Soler Espinosa | 6 | 7 | ||||||||||||||||||
| 6 | Danka Kovinić | 4 | 5 | |||||||||||||||||
| First round | Second round | Qualifying competition | ||||||||||||||||||
| 4 | Han Xinyun | 6 | 6 | |||||||||||||||||
| WC | Shuko Aoyama | 4 | 1 | |||||||||||||||||
| 4 | Han Xinyun | 67 | 5 | |||||||||||||||||
| Varvara Flink | 79 | 7 | ||||||||||||||||||
| Jaimee Fourlis | 5 | 2 | ||||||||||||||||||
| Varvara Flink | 7 | 6 | ||||||||||||||||||
| Varvara Flink | 3 | 2 | ||||||||||||||||||
| 7 | Priscilla Hon | 6 | 6 | |||||||||||||||||
| Liang En-shuo | 6 | 5 | 4 | |||||||||||||||||
| Han Na-lae | 3 | 7 | 6 | |||||||||||||||||
| Han Na-lae | 2 | 2 | ||||||||||||||||||
| 7 | Priscilla Hon | 6 | 6 | |||||||||||||||||
 Deniz Khazaniuk | 3 | 65 | ||||||||||||||||||
| 7 | Priscilla Hon | 6 | 77 | |||||||||||||||||
Chanelle Scheepers was the defending champion, but lost to Urszula Radwańska in the quarterfinals.
Hsieh Su-wei was the defending champion, but she lost in the quarterfinals to Bethanie Mattek-Sands. Karolína Plíšková defeated Mattek-Sands in the final, 1–6, 7–5, 6–3, to claim her first WTA singles title.
Hsieh Su-wei was the defending champion, but lost in the second round to Zhang Shuai.
Karolína Plíšková was the defending champion, but lost in the semifinals to Dominika Cibulková.
Samantha Stosur successfully defended her title, defeating Zarina Diyas in the final, 7–6(9–7), 6–3.
Hsieh Su-wei and Peng Shuai were the defending champions, but Peng chose not to participate this year. Hsieh played alongside Flavia Pennetta, but lost in the quarterfinals to Andrea Hlaváčková and Lucie Hradecká.
Monica Puig was the defending champion, but lost in the first round to Samantha Stosur.
This was the first edition of the tournament.
Kristýna Plíšková was the defending champion, but chose not to participate.
Christina McHale was the defending champion, but lost in the semifinals to Zarina Diyas.
Caroline Wozniacki was the defending champion and successfully defended her title, defeating Anastasia Pavlyuchenkova in the final, 6–0, 7–5. This marked Wozniacki's first title of 2017 and snapped a six-match losing streak in tournament finals.
Elina Svitolina was the defending champion, but withdrew before the tournament began.
The 2018 Japan Women's Open was a women's tennis tournament played on outdoor hard courts. It was the tenth edition of the Japan Women's Open, and part of the WTA International tournaments of the 2018 WTA Tour. It was held at the Regional Park Tennis Stadium in Hiroshima, Japan, from September 10 through September 16, 2018. This is the first year that the tournament was held in Hiroshima.
Jeļena Ostapenko was the defending champion, but lost in the second round to Ekaterina Alexandrova.
Samantha Stosur and Zhang Shuai won the women's doubles tennis title at the 2019 Australian Open, defeating defending champions Tímea Babos and Kristina Mladenovic in the final 6–3, 6–4.
Belinda Bencic was the champion the last time the event was held in 2017, but chose to compete in St. Petersburg instead.
Hsieh Su-wei was the defending champion, but lost to Nao Hibino in the quarterfinals.
Tímea Babos and Kristina Mladenovic won their second Australian Open title, defeating Hsieh Su-wei and Barbora Strýcová in the final, 6–2, 6–1. Despite the loss, Hsieh regained the WTA no. 1 doubles ranking for the first time since 2014, replacing her partner Strýcová. Mladenovic, Aryna Sabalenka and Xu Yifan were also in contention for the top ranking at the start of the tournament.
Barbora Krejčíková and Rajeev Ram were the defending champions, but Ram chose not to participate. Krejčíková played alongside Nikola Mektić, and successfully defended the title, defeating Bethanie Mattek-Sands and Jamie Murray in the final 5–7, 6–4, [10–1].
Samantha Stosur and Zhang Shuai defeated Coco Gauff and Caty McNally in the final, 6–3, 3–6, 6–3 to win the women's doubles title at the 2021 US Open. This was Stosur's fourth major title in women's doubles and eighth major overall, as well as Zhang's second major title; this was the pair's second major title, after their victory at the 2019 Australian Open. This was the first major final that either Gauff or McNally participated in.