The 1991 Porsche Tennis Grand Prix was a women's tennis tournament played on indoor hard courts at the Filderstadt Tennis Centre in Filderstadt, Germany and was part of the Tier II of the 1991 WTA Tour. It was the 14th edition of the tournament and was held from 14 October to 20 October 1991. Unseeded Anke Huber won the singles title and earned $70,000 first-prize money.[1]
See main article: 1991 Porsche Tennis Grand Prix – Singles. Anke Huber defeated 
Martina Navratilova 2–6, 6–2, 7–6(7–4)
See main article: 1991 Porsche Tennis Grand Prix – Doubles. Martina Navratilova / Jana Novotná defeated Pam Shriver / Natasha Zvereva 6–2, 5–7, 6–4
| Event | W | F | SF | QF | Round of 16 | Round of 32 | ||
| Singles | style=background:#efefef | Prize money | $70,000 | $31,500 | $15,750 | $7,900 | $4,000 | $2,100 |
|---|---|---|---|---|---|---|---|---|
| style=background:#efefef | Points | 300 | 210 | 135 | 70 | 35 | 18 | |