2018 Porsche Tennis Grand Prix – Singles
was the defending champion, but lost in the second round to CoCo Vandeweghe.
Karolína Plíšková won the title, defeating Vandeweghe in the final, 7–6, 6–4.
15-year-old Marta Kostyuk became the youngest player to win a main draw match in Stuttgart since Martina Hingis in October 1994.Seeds
The top four seeds received a bye into the second round.Draw
Finals
Top half
Qualifying
Seeds
Qualifiers
Draw
Second qualifier
Third qualifier
Fourth qualifier
