| Singles | |
|---|---|
| 2018 Koser Jewelers Tennis Challenge | |
| Champion |  Madison Brengle |
| Runner-up | Kristie Ahn |
| Score | 6–4, 1–0, ret. |
Vera Lapko was the defending champion, but chose to participate in Montreal.
Madison Brengle won the title after Kristie Ahn retired in the final at 6–4, 1–0.
Nicole Gibbs (first round)
Arantxa Rus (first round) Madison Brengle (champion)
Vera Zvonareva (first round)
Heather Watson (first round) Anastasia Potapova (second round)
Anhelina Kalinina (quarterfinals) Naomi Broady (first round)| Semifinals | Final | ||||||||||||
 Priscilla Hon | 5 | 5 | |||||||||||
| 3 | Madison Brengle | 7 | 7 | ||||||||||
| 3 | Madison Brengle | 6 | 1 | ||||||||||
| Kristie Ahn | 4 | 0r | |||||||||||
| PR | Jessica Pegula | 77 | 67 | 4 | |||||||||
| Kristie Ahn | 63 | 79 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | N Gibbs | 6 | 65 | 2 | |||||||||||||||||||||||
| P Hon | 4 | 77 | 6 | P Hon | 6 | 7 | |||||||||||||||||||||
| O Rogowska | 78 | 6 | O Rogowska | 2 | 5 | ||||||||||||||||||||||
| WC | L Davis | 66 | 4 | P Hon | 77 | 3 | |||||||||||||||||||||
| F Di Lorenzo | 6 | 6 | 7 | A Kalinina | 65 | 0r | |||||||||||||||||||||
| J Loeb | 2 | 3 | F Di Lorenzo | 3 | 2 | ||||||||||||||||||||||
| Q | H Carter | 2 | 2 | 7 | A Kalinina | 6 | 6 | ||||||||||||||||||||
| 7 | A Kalinina | 6 | 6 | P Hon | 5 | 5 | |||||||||||||||||||||
| 3 | M Brengle | 77 | 2 | 6 | 3 | M Brengle | 7 | 7 | |||||||||||||||||||
| Ar Rodionova | 63 | 6 | 1 | 3 | M Brengle | 4 | 6 | 0 | |||||||||||||||||||
| WC | J Kissell | 0 | 2 | G Taylor | 6 | 3 | 0r | ||||||||||||||||||||
| G Taylor | 6 | 6 | 3 | M Brengle | 6 | 6 | |||||||||||||||||||||
 S Lisicki | 6 | 77 | SE | A Li | 0 | 2 | |||||||||||||||||||||
| G Min | 1 | 65 | S Lisicki | 3 | 3r | ||||||||||||||||||||||
| SE | A Li | 6 | 79 | SE | A Li | 6 | 4 | ||||||||||||||||||||
| 5 | H Watson | 1 | 67 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | A Potapova | 2 | 6 | 6 | |||||||||||||||||||||||
| Q |  R Ozaki | 6 | 4 | 0 | 6 | A Potapova | 2 | 65 | |||||||||||||||||||
| WC | G Brodsky | 6 | 5 | 7 | WC | G Brodsky | 6 | 77 | |||||||||||||||||||
| WC | S Chang | 2 | 7 | 5 | WC | G Brodsky | 2 | 4 | |||||||||||||||||||
| PR |  O Govortsova | 4 | PR | J Pegula | 6 | 6 | |||||||||||||||||||||
 F Stollár | 0r | PR | O Govortsova | 2 | 2 | ||||||||||||||||||||||
| PR | J Pegula | 6 | 6 | PR | J Pegula | 6 | 6 | ||||||||||||||||||||
| 4 | V Zvonareva | 4 | 3 | PR | J Pegula | 77 | 67 | 4 | |||||||||||||||||||
| 8 | N Broady | 2 | 64 | K Ahn | 63 | 79 | 6 | ||||||||||||||||||||
| K Ahn | 6 | 77 | K Ahn | w/o | |||||||||||||||||||||||
| LL | E Hozumi | 3 | 2 | K Swan | |||||||||||||||||||||||
| K Swan | 6 | 6 | K Ahn | 4 | 6 | 6 | |||||||||||||||||||||
| Q | K Birrell | 77 | 6 | Q | K Birrell | 6 | 4 | 4 | |||||||||||||||||||
| Q |  J Ponchet | 65 | 1 | Q | K Birrell | 6 | 77 | ||||||||||||||||||||
 G García Pérez | 6 | 6 | G García Pérez | 2 | 63 | ||||||||||||||||||||||
| 2 | A Rus | 4 | 0 | ||||||||||||||||||||||||
Defending champion Anastasia Pavlyuchenkova successfully defended her title, defeating Madison Brengle in the final, 7–6(8–6), 7–6(7–3).
Caroline Wozniacki was the defending champion but did not complete in the Juniors this year.
Serena Williams was the defending champion, but withdrew due to injury.
In 2011, world number-one Caroline Wozniacki defeated Elena Vesnina in the final 6–2, 6–3 to win the women's singles tennis title at that year's Charleston Open. Samantha Stosur was the defending champion, but lost to Vesnina in the third round.
Nadia Petrova won the first edition of this tournament, defeating Shahar Pe'er 7–5, 6–2 in the final.
Shelby Rogers was the defending champion, but decided not to participate.
Garbiñe Muguruza was the defending champion heading into the tournament but chose to compete at the Sydney tennis event instead of Hobart. In the final, it was unseeded Brit Heather Watson who defeated the American qualifier in Madison Brengle, 6–3, 6–4 to record her second WTA title.
Taylor Townsend was the defending champion, but chose not to participate.
This was a new event in the 2017 ITF Women's Circuit.
Caroline Garcia was the defending champion, but lost in the semifinals to Daria Gavrilova.
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.
Sara Errani was the defending champion, but lost in the first round to Allie Kiick.
Mariana Duque Mariño was the defending champion, but she had retired from professional tennis earlier in the year.
Victoria Azarenka won the women's singles tennis title at the 2020 Cincinnati Masters via walkover, after Naomi Osaka withdrew from the final with a hamstring injury. It was Azarenka's first singles title since the 2016 Miami Open, and her first since giving birth to her son Leo in December 2016.
Caroline Dolehide was the defending champion, having won the previous edition in 2019. She lost in the second round to Katrina Scott.
Madison Brengle was the defending champion, having won the previous edition in 2019, but lost in the second round to Lesley Pattinama Kerkhove.
Catherine Bellis was the defending champion but chose not to participate.
Shelby Rogers was the defending champion, but chose not to participate.
Usue Maitane Arconada was the defending champion but chose not to participate.
Madison Brengle was the defending champion, but lost in the second round to Sofia Kenin.