By surface
| Surface | Ryan Harrison | Michael Lammer |
|---|---|---|
| Clay | 1 | 0 |
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2012-02-10 | ATP | Davis Cup WG R1: SUI vs USA | Round Robin | Clay | Ryan Harrison | 7-60 | 7-64 |
| Surface | Ryan Harrison | Michael Lammer |
|---|---|---|
| Clay | 1 | 0 |
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2012-02-10 | ATP | Davis Cup WG R1: SUI vs USA | Round Robin | Clay | Ryan Harrison | 7-60 | 7-64 |