Monica Seles defeated Irina Spirlea 6-3 6-4 in the Philadelphia round of 32 on carpet. The upset overturned the form book — Irina Spirlea came in leading the head-to-head 3–1, defending last year's semi-final. Monica Seles narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-03-30 | Hilton Head | SF | clay | Irina Spirlea | 6-4 1-6 7-6 |
| 1997-11-10 | Philadelphia | QF | carpet | Irina Spirlea | 6-4 7-6 |
| 1997-08-25 | US Open | QF | hard | Irina Spirlea | 6-7 7-6 6-3 |
| 1997-03-20 | Key Biscayne | QF | hard | Monica Seles | 3-6 6-2 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.