The 2018 Reinert Open was a professional tennis tournament played on outdoor clay courts. It was the eleventh edition of the tournament and was part of the 2018 ITF Women's Circuit. It took place in Versmold, Germany, on 9–15 July 2018.
Singles main draw entrants
Seeds
1 Rankings as of 2 July 2018.
Other entrants
The following players received a wildcard into the singles main draw: Katharina Gerlach Lena Rüffer Laura Siegemund Julyette Steur
The following players received entry from the qualifying draw: Angelica Moratelli Jule Niemeier Pemra Özgen Katarzyna Piter
Champions
Singles
Olga Danilović def. Laura Siegemund, 5–7, 6–1, 6–3
Doubles
Pemra Özgen / Despina Papamichail def. Olga Danilović / Nina Stojanović, 1–6, 6–2, [10–4]