The 2018 Porsche Tennis Grand Prix was a women's tennis tournament played on indoor clay courts. It was the 41st edition of the Porsche Tennis Grand Prix, and part of the Premier tournaments of the 2018 WTA Tour. It took place at the Porsche Arena in Stuttgart, Germany, from 23 to 29 April 2018.
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q3 | width=85 | Q2 | width=85 | Q1 |
| Singles | 470 | 305 | 185 | 100 | 55 | 1 | 25 | 18 | 13 | 1 | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 1 |
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q3 | width=85 | Q2 | width=85 | Q1 |
| Singles | €107,036 | €57,157 | €30,536 | €16,411 | €8,798 | €5,585 | €2,508 | €1,333 | €742 | |||
| Doubles * | €33,482 | €17,885 | €9,774 | €4,974 | €2,702 |
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Andreja Klepač |  Spain | María José Martínez Sánchez | 34 | 1 | ||
 Russian Federation | Alla Kudryavtseva |  Czech Republic | Andrea Sestini Hlaváčková | 42 | 2 | |
| Kiki Bertens | Demi Schuurs | 45 | 3 | |||
 United States | Raquel Atawo | Anna-Lena Grönefeld | 59 | 4 |
The following pair received a wildcard into the main draw:
See main article: 2018 Porsche Tennis Grand Prix – Singles.
Karolína Plíšková defeated CoCo Vandeweghe, 7–6(7–2), 6–4See main article: 2018 Porsche Tennis Grand Prix – Doubles.
Raquel Atawo / Anna-Lena Grönefeld defeated Nicole Melichar / Květa Peschke, 6–4, 6–7(5–7), [10–5]
Romania
Ukraine
France