Martina Hingis was the defending champion but lost in the quarterfinals to Steffi Graf.
Graf won in the final 4–6, 6–3, 6–4 against Lindsay Davenport.
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.
Lindsay Davenport (final) Martina Hingis (quarterfinals) Jana Novotná (second round) Arantxa Sánchez Vicario (second round) Monica Seles (semifinals) Nathalie Tauziat (semifinals) Patty Schnyder (second round) Sandrine Testud (first round)
Draw
Final
Top half
Bottom half
External links 1998 Advanta Championships of Philadelphia draw