# 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 the 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.
* Martina Hingis (quarterfinals)
* Lindsay Davenport (final)
* Jana Novotná (second round)
* Arantxa Sánchez Vicario (semifinals)
* Venus Williams (second round)
* Conchita Martínez (second round)
* Nathalie Tauziat (quarterfinals)
* Patty Schnyder (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Final

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| WC | Dominique Van Roost | 2 | 0 | | | | |
| | Sandrine Testud | 6 | 6 | | | | |
| | Sandrine Testud | 6 | 6 | | Sandrine Testud | 7 | 6 |
| | | | | 2 | Lindsay Davenport | 5 | 3 |
| 4 | Arantxa Sánchez Vicario | 6 | 4 | 2 | Lindsay Davenport | 5 | 3 |
| 2 | Lindsay Davenport | 7 | 6 | | | | |

### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | M Hingis | 1 | 6 | 6 | | | | | | | | | |
| | A Kournikova | 1 | 6 | 7 | | A Kournikova | 6 | 2 | 2 | | | | | | | | | |
| Q | B Schett | 6 | 4 | 6 | | | | | | 1 | M Hingis | 3 | 7 | 4 | | | | |
| | M Serna | 6 | 5 | 2 | | | | | | WC | D Van Roost | 6 | 6 | 6 | | | | |
| WC | D Van Roost | 2 | 7 | 6 | WC | D Van Roost | 6 | 6 | | | | | | | | | | |
| | S Farina | 2 | 6 | 3 | 5 | V Williams | 1 | 2 | | | | | | | | | | |
| 5 | V Williams | 6 | 4 | 6 | | | | | | | | | | | WC | D Van Roost | 2 | 0 |
| | | | | | | | | | | | | | | | | S Testud | 6 | 6 |
| | | | | | 3 | J Novotná | 6 | 3 | 0/r | | | | | | | | | |
| Q | K Hrdličková | 6 | 6 | 0 | | S Williams | 2 | 6 | 2 | | | | | | | | | |
| | S Williams | 7 | 3 | 6 | | | | | | | S Williams | 3 | 6 | 1 | | | | |
| | S Testud | 5 | 6 | 6 | | | | | | | S Testud | 6 | 1 | 6 | | | | |
| | E Likhovtseva | 7 | 1 | 0 | | S Testud | 6 | 4 | 6 | | | | | | | | | |
| | A Huber | 6 | 6 | | | A Huber | 2 | 6 | 2 | | | | | | | | | |
| 8 | P Schnyder | 4 | 1 | | | | | | | | | | | | | | | |

### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| WC/6 | C Martínez | 3 | 6 | 6 | | | | | | | | | | | | | | |
| | I Spîrlea | 6 | 2 | 2 | WC/6 | C Martínez | 4 | 6 | 2 | | | | | | | | | |
| | L Raymond | 3 | 6 | 6 | | L Raymond | 6 | 2 | 6 | | | | | | | | | |
| | R Dragomir | 6 | 2 | 4 | | | | | | | L Raymond | 6 | 5 | 2 | | | | |
| Q | A Mauresmo | 6 | 6 | | | | | | | 4 | A Sánchez Vicario | 1 | 7 | 6 | | | | |
| WC | A Glass | 2 | 1 | | Q | A Mauresmo | 3 | 2 | | | | | | | | | | |
| | | | | | 4 | A Sánchez Vicario | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 4 | A Sánchez Vicario | 6 | 4 |
| 7 | N Tauziat | 6 | 6 | 6 | | | | | | | | | | | 2 | L Davenport | 7 | 6 |
| | K Po | 4 | 7 | 2 | 7 | N Tauziat | 6 | 6 | | | | | | | | | | |
| | N Zvereva | 6 | 6 | | | N Zvereva | 3 | 3 | | | | | | | | | | |
| Q | J Kandarr | 3 | 2 | | | | | | | 7 | N Tauziat | 6 | 5 | | | | | |
| | M Pierce | 6 | 6 | | | | | | | 2 | L Davenport | 7 | 7 | | | | | |
| | A Coetzer | 2 | 2 | | | M Pierce | 1 | 3 | | | | | | | | | | |
| | | | | | 2 | L Davenport | 6 | 6 | | | | | | | | | | |