Martina Hingis defeated Irina Spirlea 6-2 7-6 in the WTA Tour Championships semi-final on carpet. The result followed the form book — Martina Hingis came in leading the head-to-head 2–0, defending last year's quarter-final. Martina Hingis extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-05-04 | Rome | R16 | clay | Martina Hingis | 6-1 6-2 |
| 1997-01-13 | Australian Open | QF | hard | Martina Hingis | 7-5 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.