| Singles | |
|---|---|
| 2015 Reinert Open | |
| Champion |  Carina Witthöft |
| Runner-up |  Johanna Larsson |
| Final score | 6–3, 6–3 |
Kateryna Kozlova was the defending champion, but was facing a six month doping ban for taking a drug containing the banned substance 1,3-Dimethylbutylamine.
Carina Witthöft won the title, defeating Johanna Larsson in the final, 6–3, 6–3.
Carina Witthöft (champion) Johanna Larsson (final) Anna-Lena Friedsam (quarterfinals)
Shahar Pe'er (first round)
Richèl Hogenkamp (quarterfinals) Laura Siegemund (semifinals)
Maryna Zanevska (first round)
Stephanie Vogt (semifinals)| Semifinals | Final | ||||||||||||
| 1/WC | Carina Witthöft | 7 | 6 | ||||||||||
| 6 | Laura Siegemund | 5 | 4 | ||||||||||
| 1/WC | Carina Witthöft | 6 | 6 | ||||||||||
| 2/WC | Johanna Larsson | 3 | 3 | ||||||||||
| 8 | Stephanie Vogt | 2 | 6 | 5 | |||||||||
| 2/WC | Johanna Larsson | 6 | 1 | 7 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1/WC | C Witthöft | 6 | 6 | ||||||||||||||||||||||||
| JE |  I Shymanovich | 2 | 3 | 1/WC | C Witthöft | 6 | 6 | ||||||||||||||||||||
 F Molinero | 3 | 6 | 3 |  E Mikulčić | 2 | 4 | |||||||||||||||||||||
| E Mikulčić | 6 | 1 | 6 | 1/WC | C Witthöft | 6 | 6 | ||||||||||||||||||||
| L Kerkhove | 64 | 3 | 5 | R Hogenkamp | 3 | 4 | |||||||||||||||||||||
| C Burger | 77 | 6 | C Burger | 6 | 65 | 4 | |||||||||||||||||||||
| Q |  V Grammatikopoulou | 6 | 4 | 4 | 5 | R Hogenkamp | 4 | 77 | 6 | ||||||||||||||||||
| 5 | R Hogenkamp | 4 | 6 | 6 | 1/WC | C Witthöft | 7 | 6 | |||||||||||||||||||
| 3 | A-L Friedsam | 6 | 6 | 6 | L Siegemund | 5 | 4 | ||||||||||||||||||||
| Q |  G Pantůčková | 3 | 0 | 3 | A-L Friedsam | 6 | 6 | ||||||||||||||||||||
| WC | K Hobgarski | 6 | 77 | WC | K Hobgarski | 1 | 2 | ||||||||||||||||||||
| A Rus | 4 | 65 | 3 | A-L Friedsam | 4 | 63 | |||||||||||||||||||||
| R Peterson | 6 | 78 | 6 | L Siegemund | 6 | 77 | |||||||||||||||||||||
 D Jakupović | 2 | 66 | R Peterson | 1 | 0 | ||||||||||||||||||||||
| T Martincová | 2 | 1 | 6 | L Siegemund | 6 | 6 | |||||||||||||||||||||
| 6 | L Siegemund | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | S Vogt | 6 | 6 | ||||||||||||||||||||||||
| WC | K Gerlach | 2 | 2 | 8 | S Vogt | 6 | 6 | ||||||||||||||||||||
 E Kostova | 4 | 2 | Q | T Korpatsch | 0 | 0 | |||||||||||||||||||||
| Q | T Korpatsch | 6 | 6 | 8 | S Vogt | 6 | 3 | 6 | |||||||||||||||||||
 D Kasatkina | 6 | 64 | 5 | A Schäfer | 1 | 6 | 1 | ||||||||||||||||||||
| O Ianchuk | 2 | 77 | 7 | O Ianchuk | 5 | 3 | |||||||||||||||||||||
| A Schäfer | 61 | 6 | 6 | A Schäfer | 7 | 6 | |||||||||||||||||||||
| 4 | S Pe'er | 77 | 4 | 0 | 8 | S Vogt | 2 | 6 | 5 | ||||||||||||||||||
| 7 | M Zanevska | 3 | 2 | 2/WC | J Larsson | 6 | 1 | 7 | |||||||||||||||||||
 C Perrin | 6 | 6 | C Perrin | 6 | 7 | ||||||||||||||||||||||
| Q | P Rohanová | 0 | 1 | K Vaňková | 4 | 5 | |||||||||||||||||||||
| K Vaňková | 6 | 6 | C Perrin | 1 | 6 | 4 | |||||||||||||||||||||
| LL | T Malíková | 1 | 4 | 2/WC | J Larsson | 6 | 2 | 6 | |||||||||||||||||||
| A Lottner | 6 | 6 | A Lottner | 6 | 4 | 2 | |||||||||||||||||||||
| R Voráčová | 2 | 4 | 2/WC | J Larsson | 3 | 6 | 6 | ||||||||||||||||||||
| 2/WC | J Larsson | 6 | 6 | ||||||||||||||||||||||||
Sandra Záhlavová was the defending champion, having won the event in 2012, but chose not to compete in 2013.
Teliana Pereira was the defending champion, having won the previous event in 2013, but retired in the semifinals against Alberta Brianti.
Sharon Fichman was the defending champion, but lost in the quarterfinals to top seed Carina Witthöft.
Mona Barthel was the defending champion, but she lost to Johanna Larsson in the final, 3–6, 6–7(2–7).
Petra Kvitová was the defending champion, and successfully defended her title, defeating compatriot and fourth seed Lucie Šafářová in the final 6–7(6–8), 6–2, 6–2.
Serena Williams was the defending champion and successfully defended her title, defeating Simona Halep in the final, 6–3, 7–6(7–5).
Karin Knapp was the defending champion but chose not to enter the tournament this year.
Nao Hibino won the title, defeating Donna Vekić in the final, 6–2, 6–2.
Angelique Kerber was the defending champion and successfully defended her title, defeating Laura Siegemund in the final, 6–4, 6–0.
Carina Witthöft was the defending champion, but lost in the final to Magda Linette, 3–6, 5–7.
Carina Witthöft was the defending champion, but chose not to participate.
Laura Siegemund was the defending champion, but chose not to participate.
Anastasia Pavlyuchenkova was the defending champion, but lost in the quarterfinals to Dominika Cibulková.
Misaki Doi was the defending champion, but lost in the first round to Lauren Davis.
Caroline Garcia was the defending champion, but lost in the semifinals to Anastasija Sevastova in a rematch of the previous year's final.
Viktorija Golubic was the defending champion, but lost in the first round to Antonia Lottner.
Karolína Plíšková was the defending champion, but lost in the semifinals to Garbiñe Muguruza.
Petra Kvitová was the defending champion, but lost in the first round to Peng Shuai.
Agnieszka Radwańska was the defending champion, but lost in the third round to Daria Kasatkina.
Laura Siegemund was the defending champion, but lost in the second round to CoCo Vandeweghe.
The singles competition of the 2018 Ladies Championship Gstaad tennis tournament was held in Gstaad, Switzerland from 16-22 July 2018. Kiki Bertens was the defending champion, but withdrew before the tournament began.