# 2018 Reinert Open – Singles

Mihaela Buzărnescu was the defending champion, but chose not to participate.
Olga Danilović won the title, defeating Laura Siegemund in the final, 5–7, 6–1, 6–3.

## Seeds

* Carina Witthöft (quarterfinals)
* Richèl Hogenkamp (first round)
* Tereza Martincová (second round)
* Tereza Smitková (first round)
* Kathinka von Deichmann (quarterfinals)
* Bibiane Schoofs (semifinals)
* Elitsa Kostova (first round)
* Çağla Büyükakçay (quarterfinals)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| WC | Laura Siegemund | 4 | 7 | 6 | | | | | |
| | Anna Zaja | 6 | 5 | 4 | | | | | |
| | Anna Zaja | 6 | 5 | 4 | WC | Laura Siegemund | 7 | 1 | 3 |
| | | | | | | Olga Danilović | 5 | 6 | 6 |
| 6 | Bibiane Schoofs | 1 | 3 | | | Olga Danilović | 5 | 6 | 6 |
| | Olga Danilović | 6 | 6 | | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | C Witthöft | 6 | 4 | 6 | | | | | | | | | | | | | | |
| | U Eikeri | 3 | 6 | 3 | 1 | C Witthöft | 3 | 7 | 7 | | | | | | | | | |
| | S Soler Espinosa | 7 | 6 | | | S Soler Espinosa | 6 | 5 | 5 | | | | | | | | | |
| WC | J Steur | 5 | 2 | | | | | | | 1 | C Witthöft | 1 | 3 | | | | | |
| | J Cristian | 4 | 1 | | | | | | | WC | L Siegemund | 6 | 6 | | | | | |
| | K Muchová | 6 | 6 | | | K Muchová | 7 | 2 | 4 | | | | | | | | | |
| WC | L Siegemund | 6 | 6 | | WC | L Siegemund | 5 | 6 | 6 | | | | | | | | | |
| 7 | E Kostova | 2 | 4 | | | | | | | | | | | WC | L Siegemund | 4 | 7 | 6 |
| 3 | T Martincová | 6$^4$ | 6 | 4 | | | | | | | | | | | A Zaja | 6 | 5 | 4 |
| | D Seguel | 7$^7$ | 4 | 0$^r$ | 3 | T Martincová | 2 | 6 | 2 | | | | | | | | | |
| Q | A Moratelli | 1 | 3 | | | A Zaja | 6 | 4 | 6 | | | | | | | | | |
| | A Zaja | 6 | 6 | | | | | | | | A Zaja | 6 | 6 | | | | | |
| WC | L Rüffer | 6 | 5 | 6 | | | | | | 8 | Ç Büyükakçay | 2 | 3 | | | | | |
| | O Ianchuk | 1 | 7 | 4 | WC | L Rüffer | 3 | 3 | | | | | | | | | | |
| WC | K Gerlach | 6 | 4 | 5 | 8 | Ç Büyükakçay | 6 | 6 | | | | | | | | | | |
| 8 | Ç Büyükakçay | 2 | 6 | 7 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | B Schoofs | 6 | 6 | | | | | | | | | | | | | | | |
| Q | J Niemeier | 4 | 2 | | 6 | B Schoofs | 7 | 6 | | | | | | | | | | |
| Q | K Piter | 6 | 6 | | Q | K Piter | 5 | 2 | | | | | | | | | | |
| | C Scholl | 3 | 1 | | | | | | | 6 | B Schoofs | 6 | 4 | 6 | | | | |
| | M Di Giuseppe | 6 | 6 | | | | | | | | M Di Giuseppe | 4 | 6 | 1 | | | | |
| Q | P Özgen | 3 | 2 | | | M Di Giuseppe | 6 | 1 | 7$^7$ | | | | | | | | | |
| | A Potapova | 6 | 4 | 7$^7$ | | A Potapova | 4 | 6 | 6$^5$ | | | | | | | | | |
| 4 | T Smitková | 4 | 6 | 6$^5$ | | | | | | | | | | | 6 | B Schoofs | 1 | 3 |
| 5 | K von Deichmann | 6 | 7$^7$ | | | | | | | | | | | | | O Danilović | 6 | 6 |
| | D Radanović | 2 | 6$^2$ | | 5 | K von Deichmann | 6 | 7$^7$ | | | | | | | | | | |
| | A Grymalska | 6$^5$ | 6 | 6 | | A Grymalska | 2 | 6$^5$ | | | | | | | | | | |
| | N Stojanović | 7$^7$ | 4 | 4 | | | | | | 5 | K von Deichmann | 2 | 5 | | | | | |
| | İ Soylu | 2 | 4 | | | | | | | | O Danilović | 6 | 7 | | | | | |
| | J Pieri | 6 | 6 | | | J Pieri | 1 | 1 | | | | | | | | | | |
| | O Danilović | 7$^7$ | 6 | | | O Danilović | 6 | 6 | | | | | | | | | | |
| 2 | R Hogenkamp | 6$^5$ | 0 | | | | | | | | | | | | | | | |