The 2019 Japan Women's Open was a women's tennis tournament played on outdoor hard courts. It was the eleventh edition of the Japan Women's Open, and part of the WTA International tournaments of the 2019 WTA Tour. It was held at the Regional Park Tennis Stadium in Hiroshima, Japan, from September 9 through September 15, 2019.[1]
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q3 | width=85 | Q2 | width=85 | Q1 |
| Singles | 280 | 180 | 110 | 60 | 30 | 1 | 18 | 14 | 10 | 1 | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 1 |
| width=130 bgcolor=dfe2e9 | Event | width=80 bgcolor=lime | W | width=85 bgcolor=thistle | F | width=85 bgcolor=ffff00 | SF | width=85 bgcolor=ffebcd | QF | width=85 bgcolor=afeeee | Round of 16 | width=85 bgcolor=afeeee | Round of 321 | width=85 | Q3 | width=85 | Q2 | width=85 | Q1 |
| Singles | $43,000 | $21,400 | $11,300 | $5,900 | $3,310 | $1,925 | $1,005 | $730 | $530 | ||||||||||
| Doubles2 | $12,300 | $6,400 | $3,435 | $1,820 | $960 |
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Hsieh Su-wei | 28 | 1 | ||
 Russian Federation | Veronika Kudermetova | 51 | 2 | |
 Belgium | Alison Van Uytvanck | 68 | 3 | |
| Russian Federation | Anastasia Potapova | 72 | 4 | |
| Tatjana Maria | 79 | 5 | ||
 Kazakhstan | Zarina Diyas | 80 | 6 | |
 Spain | Sara Sorribes Tormo | 83 | 7 | |
| Laura Siegemund | 90 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Leylah Annie Fernandez
Zoe Hives
Junri Namigata Valeria Savinykh
Patricia Maria Țig Daria Gavrilova → replaced by Priscilla Hon
Barbora Krejčíková → replaced by Nao Hibino
Anna Karolína Schmiedlová → replaced by 
Katarzyna Kawa Zarina Diyas (low back injury)| Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
| Japan | Japan | Makoto Ninomiya | 122 | 1 | |
| Belgium | Kirsten Flipkens | Belgium | Alison Van Uytvanck | 126 | 2 |
| Romania | Mihaela Buzărnescu | Katarina Srebotnik | 142 | 3 | |
| Spain | Georgina García Pérez | Spain | Sara Sorribes Tormo | 177 | 4 |
The following pairs received wildcards into the doubles main draw:
Greet Minnen (right shoulder injury)See main article: 2019 Japan Women's Open – Singles.
Nao Hibino def. Misaki Doi, 6–3, 6–2See main article: 2019 Japan Women's Open – Doubles.
Misaki Doi / Nao Hibino def. 
Christina McHale / Valeria Savinykh, 3–6, 6–4, [10–4]