Steffi Graf defeated Monica Seles 6-7 6-3 6-4 in the Roland Garros semi-final on clay. The upset overturned the form book — Monica Seles came in defending last year's final. Steffi Graf extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-01-18 | Australian Open | QF | hard | Monica Seles | 7-5 6-1 |
| 1998-11-16 | WTA Tour Championships | QF | carpet | Steffi Graf | 1-6 6-4 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.