D. Collins leads the head-to-head 3-0 since 2018 against K. Siniakova, over 3 matches.
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By surface
| Surface | K. Siniakova | D. Collins |
| Clay | 0 | 1 |
| Hard | 0 | 1 |
| Other | 0 | 1 |
Current ELO by surface
| Surface | K. Siniakova | D. Collins |
| Hard |
1806 (103-80) |
1780 (71-47) |
| Clay |
1646 (41-36) |
1861 (31-16) |
| Grass |
1741 (30-17) |
1669 (6-5) |
ELO is computed per surface from results since 2018; the win-loss pair is that surface's record.
Match history
| Date | Winner | Score | Event |
| May 22, 2024 | D. Collins | 2 - 0 | WTA Strasbourg · 1/8-finals · clay |
| Feb. 14, 2024 | D. Collins | 2 - 0 | WTA Doha · 1/8-finals · hard |
| Nov. 10, 2023 | D. Collins | 2 - 0 | WTA Billie Jean King Cup - World Group |
Recent form
| Date | | Opponent | Score | Event |
| Aug. 26, 2025 |
L |
J. Cristian |
0 - 2 |
US Open · 1/64-finals · hard |
| Aug. 8, 2025 |
L |
T. Townsend |
0 - 2 |
Cincinnati · 1/64-finals · hard |
| July 30, 2025 |
L |
C. Gauff |
2 - 1 |
Montreal · 1/32-finals · hard |
| July 28, 2025 |
W |
V. Tomova |
2 - 0 |
Montreal · 1/64-finals · hard |
| July 22, 2025 |
L |
M. Linette |
2 - 0 |
Washington · 1/16-finals · hard |
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