1998 Porsche Tennis Grand Prix – Singles

Martina Hingis was the defending champion, but lost in the quarterfinals to Dominique Van Roost.

Sandrine Testud won the title, defeating Lindsay Davenport in final 7–5, 6–3.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated. The top four seeds received a bye to the second round.


 * 1)  Martina Hingis (quarterfinals)
 * 2) 🇺🇸 Lindsay Davenport (final)
 * 3) 🇨🇿 Jana Novotná (second round)
 * 4) 🇪🇸 Arantxa Sánchez Vicario (semifinals)
 * 5) 🇺🇸 Venus Williams (second round)
 * 6) 🇪🇸 Conchita Martínez (second round)
 * 7) 🇫🇷 Nathalie Tauziat (quarterfinals)
 * 8)  Patty Schnyder (first round)