01/By surface
each with its own count, at equal weight
Hard
1-0
E. leads 1-0 in 1 meeting on hard
Clay
1-0
E. leads 1-0 in 1 meeting on clay
Grass
1-0
E. leads 1-0 in 1 meeting on grass
02/Every meeting
3 rows, newest first
| Date | Tournament | Surface | Round | Winner | Score, winner first | Ranks, E. first |
|---|---|---|---|---|---|---|
| Jun 30, 2026 | WimbledonGrand Slam | grass | 1st round | Mertens E. | 6-2, 6-4 | 27 v 40 |
| Sep 1, 2020 | US OpenGrand Slam | hard | 1st round | Mertens E. | 6-2, 6-2 | 18 v 64 |
| May 2, 2018 | Grand Prix SAR Lalla MeryemInternational | clay | 2nd round | Mertens E.ret. | 6-7, 6-0, 3-1 | 19 v 226 |
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. Mertens E. and Siegemund L. each carry the table against every opponent faced.