| Singles | |
|---|---|
| 1998 Porsche Tennis Grand Prix | |
| Champion |  Sandrine Testud |
| Runner-up |  Lindsay Davenport |
| Score | 7–5, 6–3 |
| Draw | 28 (3WC / 4Q) |
| Seeds | 8 |
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.
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)| Semifinals | Final | ||||||||||||
| WC |  Dominique Van Roost | 2 | 0 | ||||||||||
| Sandrine Testud | 6 | 6 | |||||||||||
| Sandrine Testud | 7 | 6 | |||||||||||
| 2 | Lindsay Davenport | 5 | 3 | ||||||||||
| 4 | Arantxa Sánchez Vicario | 6 | 4 | ||||||||||
| 2 | Lindsay Davenport | 7 | 6 | ||||||||||
| First round | Second round | Quarterfinals | 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 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | 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 | ||||||||||||||||||||||||
Iva Majoli was the defending champion but lost in the quarterfinals to Judith Wiesner.
Magdalena Maleeva was the defending champion but lost in the first round to Kimberly Po.
Martina Hingis won the singles tennis title at the 1997 Pan Pacific Open via walkover walkover after Steffi Graf withdrew from the final.
Gigi Fernández and Natasha Zvereva were the defending champions but they competed with different partners that year, Fernández with Martina Hingis and Zvereva with Lindsay Davenport.
Jana Novotná and Arantxa Sánchez Vicario were the defending champions but only Novotná competed that year with Lindsay Davenport.
Martina Hingis was the defending champion and won in the final 6–0, 6–2 against Conchita Martínez.
Lindsay Davenport was the defending champion but lost in the final 5–7, 7–5, 6–4 against Monica Seles.
Nicole Arendt and Jana Novotná were the defending champions but only Novotná competed that year with Lindsay Davenport.
Jana Novotná was the defending champion but lost in the quarterfinals to Lindsay Davenport.
Martina Hingis was the defending champion but lost in the second round to Venus Williams.
Lindsay Davenport defeated the defending champion Martina Hingis in the final, 6–3, 6–3 to win the singles tennis title at the 1998 Pan Pacific Open.
Martina Hingis was the defending champion but did not compete that year.
Martina Hingis was the defending champion but lost in the semifinals to Mary Pierce.
Monica Seles was the defending champion but lost in the semifinals to Lindsay Davenport.
Martina Hingis was the defending champion but lost in the quarterfinals to Steffi Graf.
Martina Hingis defeated Lindsay Davenport in the final, 7–5, 6–4, 4–6, 6–2 to win the singles tennis title at the 1998 Chase Championships.
Two-time defending champion Lindsay Davenport and her partner Natasha Zvereva defeated Alexandra Fusai and Nathalie Tauziat in the final, 6–7(6–8), 7–5, 6–3 to win the doubles tennis title at the 1998 WTA Tour Championships.
Amélie Mauresmo was the defending champion but withdrew from her semifinal match against Lindsay Davenport.
Lindsay Davenport defeated Martina Hingis in the final, 4–6, 6–4, 6–0 to win the women's singles tennis title at the 2000 Indian Wells Masters.
Martina Hingis and Jana Novotná defeated the defending champion Natasha Zvereva and her partner Lindsay Davenport in the final, 6–1, 7–6(7–4) to win the women's doubles tennis title at the 1998 French Open. They did not drop a single set en route to the title. It was the second step in an eventual Grand Slam for Hingis.