# 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.
* 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
### 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

| Final | Final | Final | Final | Final |
| 1 | Lindsay Davenport | 6 | 3 | 4 |
| | Steffi Graf | 4 | 6 | 6 |

### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | L Davenport | 6 | 6 | | | | | | | | | |
| | C Morariu | 1 | 3 | | | K Po | 1 | 2 | | | | | | | | | |
| | K Po | 6 | 6 | | | | | | 1 | L Davenport | 5 | 6 | 6 | | | | |
| | I Majoli | 6 | 2 | 4 | | | | | Q | A Frazier | 7 | 3 | 3 | | | | |
| Q | A Frazier | 2 | 6 | 6 | Q | A Frazier | 6 | 6 | | | | | | | | | |
| WC | S Farina | 6 | 6 | 4 | 7 | P Schnyder | 3 | 1 | | | | | | | | | |
| 7 | P Schnyder | 7 | 4 | 6 | | | | | | | | | | 1 | L Davenport | 6 | 6 |
| | | | | | | | | | | | | | | 5 | M Seles | 3 | 3 |
| | | | | | 3 | J Novotná | 4 | 4 | | | | | | | | | |
| | N Zvereva | 6 | 6 | | | N Zvereva | 6 | 6 | | | | | | | | | |
| WC | T Snyder | 2 | 1 | | | | | | | N Zvereva | 0 | 1 | | | | | |
| | M Vento | 1 | 2 | | | | | | 5 | M Seles | 6 | 6 | | | | | |
| | A Sugiyama | 6 | 6 | | | A Sugiyama | 3 | 5 | | | | | | | | | |
| | I Spîrlea | 3 | 4 | | 5 | M Seles | 6 | 7 | | | | | | | | | |
| 5 | M Seles | 6 | 6 | | | | | | | | | | | | | | |

### 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 |
| 6 | N Tauziat | 6 | 6 | | | | | | | | | | | | | | | |
| | A Huber | 3 | 2 | | 6 | N Tauziat | 6 | 7 | | | | | | | | | | |
| | L Raymond | 6 | 6 | | | L Raymond | 2 | 6 | | | | | | | | | | |
| Q | E Callens | 3 | 3 | | | | | | | 6 | N Tauziat | 6 | 4 | 6 | | | | |
| Q | S Cacic | 2 | 0 | | | | | | | | A Coetzer | 3 | 6 | 4 | | | | |
| | A Coetzer | 6 | 6 | | | A Coetzer | 6 | 6 | | | | | | | | | | |
| | | | | | 4 | A Sánchez-Vicario | 4 | 1 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 6 | N Tauziat | 1 | 4 |
| 8 | S Testud | 6 | 7 | 0/r | | | | | | | | | | | | S Graf | 6 | 6 |
| | E Likhovtseva | 7 | 6 | 1 | | E Likhovtseva | 7 | 2 | 4 | | | | | | | | | |
| | S Graf | 6 | 7 | | | S Graf | 6 | 6 | 6 | | | | | | | | | |
| WC | M J Fernández | 3 | 6 | | | | | | | | S Graf | 6 | 4 | 6 | | | | |
| Q | B Rippner | 7 | 6 | | | | | | | 2 | M Hingis | 2 | 6 | 0 | | | | |
| | A Fusai | 6 | 2 | | Q | B Rippner | 4 | 1 | | | | | | | | | | |
| | | | | | 2 | M Hingis | 6 | 6 | | | | | | | | | | |