| Singles | |
|---|---|
| 1998 Open Gaz de France | |
| Champion |  Mary Pierce |
| Runner-up |  Dominique Van Roost |
| Final score | 6–3, 7–5 |
| Draw | 28 |
| Seeds | 8 |
Martina Hingis was the defending champion but did not compete that year.
Mary Pierce won in the final 6–3, 7–5 against Dominique Van Roost.
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.
Jana Novotná (semifinals)
Iva Majoli (quarterfinals) Mary Pierce (champion) Nathalie Tauziat (semifinals)
Anke Huber (quarterfinals) Dominique Van Roost (final)
Barbara Paulus (quarterfinals) Sabine Appelmans (second round)| Final | ||||||
| 3 | Mary Pierce | 6 | 7 | |||
| 6 | Dominique Van Roost | 3 | 5 | |||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | J Novotná | 6 | 6 | ||||||||||||||||||||||||
 R Grande | 7 | 6 | R Grande | 1 | 4 | ||||||||||||||||||||||
 M Oremans | 6 | 1 | 1 | J Novotná | 6 | 1 | 6 | ||||||||||||||||||||
| S Farina | 2 | 6 | 6 | 7 | B Paulus | 2 | 6 | 4 | |||||||||||||||||||
| D Chládková | 6 | 2 | 3 | S Farina | 1 | 3 | |||||||||||||||||||||
| S Kleinová | 3 | 5 | 7 | B Paulus | 6 | 6 | |||||||||||||||||||||
| 7 | B Paulus | 6 | 7 | 1 | J Novotná | 4 | 6 | 3 | |||||||||||||||||||
| 3 | M Pierce | 6 | 2 | 6 | |||||||||||||||||||||||
| 3 | M Pierce | 6 | 1 | 6 | |||||||||||||||||||||||
 K Habšudová | 7 | 4 | 6 | K Habšudová | 1 | 6 | 1 | ||||||||||||||||||||
| J Halard-Decugis | 6 | 6 | 4 | 3 | M Pierce | 1 | 6 | 6 | |||||||||||||||||||
| WC | A Dechaume-Balleret | 3 | 5 | 5 | A Huber | 6 | 1 | 2 | |||||||||||||||||||
 A Kournikova | 6 | 7 | A Kournikova | 2 | 6 | 4 | |||||||||||||||||||||
| WC | A Fusai | 1 | 1 | 5 | A Huber | 6 | 1 | 6 | |||||||||||||||||||
| 5 | A Huber | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | S Appelmans | 6 | 6 | ||||||||||||||||||||||||
| Q |  L Savchenko | 1 | 3 | 8 | S Appelmans | 7 | 3 | 1 | |||||||||||||||||||
| LL | S Pitkowski | 6 | 6 | LL | S Pitkowski | 5 | 6 | 6 | |||||||||||||||||||
| A-G Sidot | 4 | 0 | LL | S Pitkowski | 1 | 6 | 6 | ||||||||||||||||||||
 M Maleeva | 0 | 2 | 4 | N Tauziat | 6 | 2 | 7 | ||||||||||||||||||||
| Q | É Loit | 6 | 6 | Q | É Loit | 6 | 6 | 4 | |||||||||||||||||||
| 4 | N Tauziat | 4 | 7 | 6 | |||||||||||||||||||||||
| 4 | N Tauziat | 6 | 6 | 1 | |||||||||||||||||||||||
| 6 | D Van Roost | 6 | 4 | 6 | 6 | D Van Roost | 7 | 1 | 6 | ||||||||||||||||||
| B Schett | 2 | 6 | 0 | 6 | D Van Roost | 5 | 6 | 7 | |||||||||||||||||||
| Q | L Courtois | 6 | 5 | 4 | Q | W Probst | 7 | 2 | 6 | ||||||||||||||||||
| Q | W Probst | 3 | 7 | 6 | 6 | D Van Roost | 7 | 6 | |||||||||||||||||||
 F Labat | 6 | 6 | 2 | I Majoli | 5 | 3 | |||||||||||||||||||||
| E Likhovtseva | 4 | 1 | F Labat | 7 | 2 | 4 | |||||||||||||||||||||
| 2 | I Majoli | 5 | 6 | 6 | |||||||||||||||||||||||
Ludmila Richterová was the defending champion but did not compete that year.
Dominique Van Roost was the defending champion but lost in the quarterfinals to Rita Grande.
Meredith McGrath was the defending champion, but did not participate this year.
Anke Huber was the defending champion but lost in the semifinals to Miriam Oremans.
Shi-Ting Wang was the defending champion but lost in the first round to Maria Vento.
Jana Novotná was the defending champion but lost in the semifinals to Lindsay Davenport.
Ruxandra Dragomir was the defending champion of the Volvo Women's Open but lost in the semifinals to Henrieta Nagyová.
Marion Maruska was the defending champion but lost in the first round to Meike Babel.
Dominique Van Roost was the defending champion but lost in the final 6–3, 6–2 against Patty Schnyder.
Chanda Rubin was the defending champion, but chose not compete that year.
Mary Pierce was the defending champion but lost in the third round to Mirjana Lučić.
Mary Joe Fernández was the defending champion but did not compete that year.
Jana Novotná was the defending champion but did not compete that year.
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