01/By surface
each with its own count, at equal weight
Hard
2-0
S. leads 2-0 in 2 meetings on hard
Clay
1-0
S. leads 1-0 in 1 meeting on clay
Grass
Never on grass
no meeting on this surface
02/Every meeting
3 rows, newest first
| Date | Tournament | Surface | Round | Winner | Score, winner first | Ranks, S. first |
|---|---|---|---|---|---|---|
| Feb 26, 2025 | ATX OpenWTA250 | hard | 1st round | Cirstea S. | 6-3, 0-6, 6-1 | 120 v 83 |
| Aug 30, 2022 | US OpenGrand Slam | hard | 1st round | Cirstea S. | 6-4, 6-4 | 37 v 182 |
| May 4, 2016 | Mutua Madrid OpenPremier | clay | 3rd round | Cirstea S. | 6-4, 7-6 | 127 v 44 |
A record, never a share of meetings. Main-draw singles since 2013; a meeting ended by retirement is counted with the sets that were played and marked; a walkover is listed and counted in neither column. Cirstea S. and Siegemund L. each carry the table against every opponent faced.