| Women's singles | |
|---|---|
| 2018 Stockton Challenger | |
| Champion |  Madison Brengle |
| Runner-up | Danielle Lao |
| Score | 7–5, 7–6(12–10) |
Sofia Kenin was the defending champion, but chose not to participate.
Madison Brengle won the title, defeating Danielle Lao in an all-American final, 7–5, 7–6(12–10).
Madison Brengle (champion) Jessica Pegula (semifinals)
Sofya Zhuk (semifinals)
Marie Bouzková (second round) Kristie Ahn (first round) Jamie Loeb (second round)
Beatriz Haddad Maia (first round) Lauren Davis (second round)| Semifinals | Final | ||||||||||||
| 1 | Madison Brengle | 6 | 6 | ||||||||||
| 3 | Sofya Zhuk | 1 | 1 | ||||||||||
| 1 | Madison Brengle | 7 | 712 | ||||||||||
| Danielle Lao | 5 | 610 | |||||||||||
| Danielle Lao | 1 | 6 | 6 | ||||||||||
| 2 | Jessica Pegula | 6 | 2 | 2 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | M Brengle | 6 | 7 | ||||||||||||||||||||||||
 U Eikeri | 4 | 5 | 1 | M Brengle | 6 | 6 | |||||||||||||||||||||
| LL | J Elie | 3 | 1 | A Kratzer | 3 | 1 | |||||||||||||||||||||
| A Kratzer | 6 | 6 | 1 | M Brengle | 6 | 6 | |||||||||||||||||||||
 J Jakšić | 1r | A Li | 2 | 1 | |||||||||||||||||||||||
| A Li | 4 | A Li | 6 | 7 | |||||||||||||||||||||||
| WC | V Duval | 6 | 5 | 5 | 8 | L Davis | 2 | 5 | |||||||||||||||||||
| 8 | L Davis | 4 | 7 | 7 | 1 | M Brengle | 6 | 6 | |||||||||||||||||||
| 3 | S Zhuk | 6 | 79 | 3 | S Zhuk | 1 | 1 | ||||||||||||||||||||
| K Day | 3 | 67 | 3 | S Zhuk | 6 | 6 | |||||||||||||||||||||
| Q | M Manasse | 77 | 4 | 6 | Q | M Manasse | 4 | 3 | |||||||||||||||||||
 R Marino | 64 | 6 | 0 | 3 | S Zhuk | 4 | 6 | 6 | |||||||||||||||||||
 M Osaka | 6 | 6 | R Anderson | 6 | 4 | 4 | |||||||||||||||||||||
| M Sanchez | 1 | 3 | M Osaka | 5 | 4 | ||||||||||||||||||||||
| R Anderson | 6 | 4 | 77 | R Anderson | 7 | 6 | |||||||||||||||||||||
| 5 | K Ahn | 1 | 6 | 64 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6/WC | J Loeb | 6 | 6 | ||||||||||||||||||||||||
| E Bektas | 4 | 1 | 6/WC | J Loeb | 3 | 1 | |||||||||||||||||||||
| Q | K Volynets | 5 | 1 | JE | W Osuigwe | 6 | 6 | ||||||||||||||||||||
| JE | W Osuigwe | 7 | 6 | JE | W Osuigwe | 2 | 0 | ||||||||||||||||||||
| Q | S Marand | 0 | 6 | 64 | D Lao | 6 | 6 | ||||||||||||||||||||
| D Lao | 6 | 2 | 77 | D Lao | 6 | 6 | |||||||||||||||||||||
| WC | D Willson | 1 | 0 | 4 | M Bouzková | 3 | 3 | ||||||||||||||||||||
| 4 | M Bouzková | 6 | 6 | D Lao | 1 | 6 | 6 | ||||||||||||||||||||
| 7 | B Haddad Maia | 6 | 5 | 0r | 2 | J Pegula | 6 | 2 | 2 | ||||||||||||||||||
 S Karatantcheva | 4 | 7 | 0 | S Karatantcheva | 6 | 61 | 2 | ||||||||||||||||||||
| L Chirico | 4 | 1 | Q |  A Sadiković | 2 | 77 | 6 | ||||||||||||||||||||
| Q | A Sadiković | 6 | 6 | Q | A Sadiković | 4 | 0 | ||||||||||||||||||||
| WC | H Carter | 77 | 2 | 6 | 2 | J Pegula | 6 | 6 | |||||||||||||||||||
| K Sebov | 62 | 6 | 1 | WC | H Carter | 63 | 0 | ||||||||||||||||||||
 N Podoroska | 0 | 0r | 2 | J Pegula | 77 | 6 | |||||||||||||||||||||
| 2 | J Pegula | 6 | 0 | ||||||||||||||||||||||||
Anastasia Pavlyuchenkova was the defending champion and successfully defended her title, defeating Madison Brengle in the final, 7–6(8–6), 7–6(7–3).
France's Alizé Cornet won the title, defeating Mariana Duque Marino in the final, 4-6, 6–1, 6–0.
Anastasia Pavlyuchenkova was the two-time defending champion, having won the junior Australian Open titles in 2006 and 2007, but lost in the quarterfinals to Simona Halep.
Serena Williams was the defending champion, but withdrew due to injury.
Nadia Petrova won the first edition of this tournament, defeating Shahar Pe'er 7–5, 6–2 in the final.
Tamira Paszek was the defending champion, but lost in the semifinals to Marina Erakovic.
Shelby Rogers was the defending champion, but decided not to participate.
Melanie Oudin was the defending champion, having won the event in 2013, but lost in the second round to Jennifer Brady.
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.
Anna Schmiedlová was the defending champion but chose not to participate.
Angelique Kerber was the defending champion and successfully defended her title, defeating Laura Siegemund in the final, 6–4, 6–0.
Belinda Bencic was the defending champion, but lost in the second round to Elena Vesnina.
Taylor Townsend was the defending champion, but chose not to participate.
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.
Tatjana Maria was the defending champion, but chose to compete at the 2018 St. Petersburg Ladies' Trophy instead.
Madison Brengle was the defending champion but lost in the second round to Mari Osaka.
Shelby Rogers was the defending champion, but chose not to participate.
Viktorija Golubic was the defending champion, but chose not to participate.
Usue Maitane Arconada was the defending champion but chose not to participate.