| Women's singles | |
|---|---|
| 2018 Kentucky Bank Tennis Championships | |
| Champion |  Asia Muhammad |
| Runner-up | Ann Li |
| Final score | 7–5, 6–1 |
Grace Min was the defending champion, but lost in the first round to Asia Muhammad.
Muhammad went on to win the title, defeating Ann Li in the final, 7–5, 6–1.
Arantxa Rus (second round)
Arina Rodionova (second round) Lizette Cabrera (first round)
Marie Bouzková (quarterfinals) Grace Min (first round)
Gabriella Taylor (second round)
Julia Glushko (second round) Jaimee Fourlis (second round)| Semifinals | Final | ||||||||||||
| WC | Quinn Gleason | 4 | 4 | ||||||||||
| Asia Muhammad | 6 | 6 | |||||||||||
| Asia Muhammad | 7 | 6 | |||||||||||
| WC | Ann Li | 5 | 1 | ||||||||||
| PR | Jessica Pegula | 6 | 3 | 4 | |||||||||
| WC | Ann Li | 2 | 6 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | A Rus | 6 | 6 | ||||||||||||||||||||||||
 E Hozumi | 4 | 4 | 1 | A Rus | 3 | 3 | |||||||||||||||||||||
 J Ponchet | 6 | 6 | J Ponchet | 6 | 6 | ||||||||||||||||||||||
| V Duval | 4 | 4 | J Ponchet | 3 | 6 | 1 | |||||||||||||||||||||
 A Tere-Apisah | 3 | 5 | WC | Q Gleason | 6 | 3 | 6 | ||||||||||||||||||||
| WC | Q Gleason | 6 | 7 | WC | Q Gleason | 7 | 6 | ||||||||||||||||||||
 C Simmonds | 6 | 4 | 4 | 8 | J Fourlis | 5 | 4 | ||||||||||||||||||||
| 8 | J Fourlis | 4 | 6 | 6 | WC | Q Gleason | 4 | 4 | |||||||||||||||||||
| 4 | M Bouzková | 3 | 6 | 6 | A Muhammad | 6 | 6 | ||||||||||||||||||||
| Q | S Marand | 6 | 2 | 4 | 4 | M Bouzková | 6 | 6 | |||||||||||||||||||
| E Bektas | 4 | 4 | WC | J Elie | 0 | 3 | |||||||||||||||||||||
| WC | J Elie | 6 | 6 | 4 | M Bouzková | 5 | 7 | 3 | |||||||||||||||||||
| Q | K Shaffer | 6 | 6 | A Muhammad | 7 | 5 | 6 | ||||||||||||||||||||
| SE | G Brodsky | 3 | 3 | Q | K Shaffer | 1 | 1 | ||||||||||||||||||||
| A Muhammad | 2 | 6 | 6 | A Muhammad | 6 | 6 | |||||||||||||||||||||
| 5 | G Min | 6 | 1 | 3 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | G Taylor | 6 | 6 | ||||||||||||||||||||||||
| WC | P Stearns | 3 | 3 | 6 | G Taylor | 3 | 62 | ||||||||||||||||||||
| PR | J Pegula | 6 | 1 | 6 | PR | J Pegula | 6 | 77 | |||||||||||||||||||
| M Doi | 4 | 6 | 2 | PR | J Pegula | 6 | 5 | 7 | |||||||||||||||||||
| Q | A Bai | 1 | 4 | K Dunne | 2 | 7 | 5 | ||||||||||||||||||||
| K Dunne | 6 | 6 | K Dunne | 77 | 6 | ||||||||||||||||||||||
| A Sharma | 6 | 6 | A Sharma | 65 | 3 | ||||||||||||||||||||||
| 3 | L Cabrera | 2 | 0 | PR | J Pegula | 6 | 3 | 4 | |||||||||||||||||||
| 7 | J Glushko | 6 | 1 | 7 | WC | A Li | 2 | 6 | 6 | ||||||||||||||||||
| K Birrell | 4 | 6 | 5 | 7 | J Glushko | 5 | 6 | 4 | |||||||||||||||||||
 R Zarazúa | 4 | 0 | WC | A Li | 7 | 3 | 6 | ||||||||||||||||||||
| WC | A Li | 6 | 6 | WC | A Li | 6 | 6 | ||||||||||||||||||||
| V Rodríguez | 2 | 2 | Q | A Nefedova | 2 | 2 | |||||||||||||||||||||
| Q | A Nefedova | 6 | 6 | Q | A Nefedova | 77 | 2 | 6 | |||||||||||||||||||
| E Perez | 1 | 6 | 2 | 2 | Ar Rodionova | 63 | 6 | 3 | |||||||||||||||||||
| 2 | Ar Rodionova | 6 | 3 | 6 | |||||||||||||||||||||||
Tímea Babos and Sloane Stephens were the defending champions but were no longer eligible to compete as juniors.
Daria Gavrilova was the defending champion, but lost to Victoria Duval in the second round.
Sabine Lisicki was the defending champion but was defeated in the second round by Urszula Radwańska.
Serena Williams was the defending champion, and successfully defended her title, defeating lucky loser Coco Vandeweghe in the final, 7–5, 6–3. It was the first all-American final on the WTA Tour since the 2009 WTA Tour Championships, and the first on American soil since Los Angeles in 2004.
Sara Errani was the defending champion and she retained her title, beating Carla Suárez Navarro in the final, 6–0, 6–4.
Serena Williams was the defending champion, and successfully defended her title, defeating Jelena Janković in the final 3–6, 6–0, 6–2.
In the first edition of the tournament, Simona Halep defeated wild card Andrea Petkovic in the final, 6–3, 6–3, to claim her first WTA singles title.
Kirsten Flipkens was the defending champion, but lost in the first round to Polona Hercog.
Venus Williams was the defending champion, but decided not to participate.
Caroline Wozniacki won the title, defeating Annika Beck in the final, 6–2, 6–2.
Agnieszka Radwańska was the defending champion, but lost to Varvara Lepchenko in the quarterfinals.
Ana Ivanovic was the defending champion, but lost to Caroline Garcia in the semifinals.
Ana Konjuh was the defending champion, but withdrew before the tournament began.
Irina-Camelia Begu was the defending champion, but lost in the second round to Jana Čepelová.
Sloane Stephens was the defending champion, but did not participate this year as she was recovering from foot surgery.
Karolína Plíšková was the defending champion, but chose not to participate this year.
Michaëlla Krajicek was the defending champion, but chose not to participate.
This was the first edition of the tournament.
Madison Keys was the defending champion but lost to compatriot Sloane Stephens in the second round, in a rematch of the previous tournament's quarterfinal.