| Women's singles | |
|---|---|
| 2008 AIG Japan Open Tennis Championships | |
| Champion |  Caroline Wozniacki |
| Runner-up |  Kaia Kanepi |
| Final score | 6–2, 3–6, 6–1 |
| Draw | 32 (4 Q / 2 WC ) |
| Seeds | 8 |
Virginie Razzano was the defending champion, but chose not to participate that year.
First-seeded Caroline Wozniacki won in the final 6–2, 3–6, 6–1, against fifth-seeded Kaia Kanepi.
Caroline Wozniacki (champion)
Anabel Medina Garrigues (second round)
Zheng Jie (first round)
Maria Kirilenko (first round) Kaia Kanepi (final)
Shahar Pe'er (second round)
Tamarine Tanasugarn (quarterfinals)
Aleksandra Wozniak (semifinals)| Semifinals | Final | ||||||||||||
| 1 | Caroline Wozniacki | 6 | 6 | ||||||||||
| LL |  Jarmila Gajdošová | 4 | 3 | ||||||||||
| 1 | Caroline Wozniacki | 6 | 3 | 6 | |||||||||
| 5 | Kaia Kanepi | 2 | 6 | 1 | |||||||||
| 5 | Kaia Kanepi | 6 | 6 | ||||||||||
| 8 | Aleksandra Wozniak | 4 | 4 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | C Wozniacki | 4 | 6 | 6 | |||||||||||||||||||||||
 G Dulko | 6 | 0 | 3 | 1 | C Wozniacki | 6 | 6 | ||||||||||||||||||||
 M Erakovic | 1 | 4 | WC |  A Morita | 2 | 1 | |||||||||||||||||||||
| WC | A Morita | 6 | 6 | 1 | C Wozniacki | 6 | 6 | ||||||||||||||||||||
 C Pin | 6 | 7 | 7 | T Tanasugarn | 4 | 1 | |||||||||||||||||||||
| C Suárez Navarro | 0 | 5 | C Pin | 2 | 2 | ||||||||||||||||||||||
| Q | S Dubois | 1 | 3 | 7 | T Tanasugarn | 6 | 6 | ||||||||||||||||||||
| 7 | T Tanasugarn | 6 | 6 | 1 | C Wozniacki | 6 | 6 | ||||||||||||||||||||
| 4 | M Kirilenko | 6 | 2 | 5 | LL | J Gajdošová | 4 | 3 | |||||||||||||||||||
 K Zakopalová | 4 | 6 | 7 | K Zakopalová | 6 | 6 | |||||||||||||||||||||
| WC | A Nakamura | 4 | 5 |  M Domachowska | 3 | 0 | |||||||||||||||||||||
| M Domachowska | 6 | 7 | K Zakopalová | 5 | 5 | ||||||||||||||||||||||
 M Santangelo | 4 | 60 | LL | J Gajdošová | 7 | 7 | |||||||||||||||||||||
| LL | J Gajdošová | 6 | 7 | LL | J Gajdošová | 5 | 6 | 7 | |||||||||||||||||||
| K Date-Krumm | 3 | 1 | 6 | S Pe'er | 7 | 1 | 69 | ||||||||||||||||||||
| 6 | S Pe'er | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | K Kanepi | 4 | 6 | 6 | |||||||||||||||||||||||
| L Šafářová | 6 | 3 | 4 | 5 | K Kanepi | 3 | 6 | 6 | |||||||||||||||||||
| I Benešová | 4 | 6 | 3 |  Y Wickmayer | 6 | 1 | 0 | ||||||||||||||||||||
| Y Wickmayer | 6 | 3 | 6 | 5 | K Kanepi | 77 | 77 | ||||||||||||||||||||
| P Cetkovská | 66 | 4 | A Pavlyuchenkova | 64 | 61 | ||||||||||||||||||||||
| Q | R Fujiwara | 77 | 6 | Q | R Fujiwara | 2 | 2 | ||||||||||||||||||||
| A Pavlyuchenkova | 6 | 6 | A Pavlyuchenkova | 6 | 6 | ||||||||||||||||||||||
| 3 | J Zheng | 1 | 2 | 5 | K Kanepi | 6 | 6 | ||||||||||||||||||||
| 8 | A Wozniak | 7 | 62 | 6 | 8 | A Wozniak | 4 | 4 | |||||||||||||||||||
 J Craybas | 5 | 7 | 3 | 8 | A Wozniak | 6 | 6 | ||||||||||||||||||||
| Q | R Fuda | 7 | 6 | Q | R Fuda | 1 | 1 | ||||||||||||||||||||
| P Parmentier | 5 | 2 | 8 | A Wozniak | 7 | 6 | |||||||||||||||||||||
 S Stosur | 6 | S Stosur | 5 | 3 | |||||||||||||||||||||||
| Q | V King | 2 | r | S Stosur | 6 | 7 | |||||||||||||||||||||
 Y-j Chan | 6 | 3 | 3 | 2 | A Medina Garrigues | 1 | 5 | ||||||||||||||||||||
| 2 | A Medina Garrigues | 3 | 6 | 6 | |||||||||||||||||||||||
Jelena Janković was the two-time defending champion, but lost in the quarterfinals to Svetlana Kuznetsova.
This was the first edition of the women's tournament.
World No. 1 Dinara Safina was the defending champion, but she lost in the third round against Zheng Jie.
Defending champion Kim Clijsters successfully defended her title, defeating Vera Zvonareva in the final, 6–2, 6–1 to win the women's singles tennis title at the 2010 US Open.
Venus Williams was the two-time defending champion, but withdrew before the tournament started due to injury.
Jelena Janković was the defending champion, but lost to compatriot Ana Ivanovic in the fourth round.
Kim Clijsters was the defending champion, but lost to Victoria Azarenka in the quarterfinals.
Aravane Rezaï was the defending champion; however, she was eliminated by Sofia Arvidsson in the first round.
María José Martínez Sánchez was the defending champion, but lost in the first round to Ekaterina Makarova.
Li Na defeated the defending champion Francesca Schiavone in the final, 6–4, 7–6(7–0) to win the women's singles tennis title at the 2011 French Open. It was her maiden major title, and she became the first Asian and Chinese player to win a major.
Caroline Wozniacki was the defending champion, but lost to Kaia Kanepi in the third round.
Li Na was the defending champion, but lost the final against Victoria Azarenka, 6–2, 1–6, 6–3.
Caroline Wozniacki was the defending champion, but was defeated in the fourth round by Ana Ivanovic.
Caroline Wozniacki was the defending champion, but lost to Angelique Kerber 6–4, 6–4 in the final.
María José Martínez Sánchez was the defending champion, but lost to Ekaterina Makarova in the quarterfinals.
Caroline Wozniacki won the title, defeating Kaia Kanepi in the final, 6–1, 6–0. This was the first title in 13 months for the former World No. 1 and her first of 2012.
Agnieszka Radwańska was the defending champion but decided not to participate.
Simona Halep was the defending champion, but lost in the second round to Magdaléna Rybáriková.
Naomi Osaka defeated Serena Williams in the final, 6–2, 6–4 to win the women's singles tennis title at the 2018 US Open. She became the first Japanese player to win a major singles title. She lost only one set during the tournament, to Aryna Sabalenka in the fourth round. Following the win, Osaka also made her top 10 rankings debut. Williams was attempting to equal Margaret Court's all-time record of 24 major singles titles, and to set a new Open Era record by winning a seventh US Open singles title.
Elina Svitolina was the defending champion and successfully defended her title, defeating Simona Halep in a rematch of the previous year's final, 6–0, 6–4.
Garbiñe Muguruza was the defending champion, but lost in the second round to Lesia Tsurenko.