C. Ruud and R. Collignon are level 1-1 in their head-to-head since 2018 over 2 matches.
| Surface | C. Ruud | R. Collignon |
|---|---|---|
| Clay | 1 | 0 |
| Hard | 0 | 1 |
| Date | Winner | Score | Event |
|---|---|---|---|
| May 20, 2026 | C. Ruud | 2 - 0 | Geneva · 1/8-finals · clay |
| Aug. 27, 2025 | R. Collignon | 3 - 2 | US Open · 1/32-finals · hard |