1998 Advanta Championships of Philadelphia – Singles

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.


 * 1) 🇺🇸 Lindsay Davenport (final)
 * 2)  Martina Hingis (quarterfinals)
 * 3) 🇨🇿 Jana Novotná (second round)
 * 4) 🇪🇸 Arantxa Sánchez-Vicario (second round)
 * 5) 🇺🇸 Monica Seles (semifinals)
 * 6) 🇫🇷 Nathalie Tauziat (semifinals)
 * 7)  Patty Schnyder (second round)
 * 8) 🇫🇷 Sandrine Testud (first round)