| Super League 1989/1990 Abstieg Gruppe A - Appearances as Referee |  |
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| 28/04/1990 | FC Zürich | - | Servette FC | 1:2 | 4 | - | - |
| 26/05/1990 | Servette FC | - | AC Bellinzona | 2:1 | 1 | - | - |
| Super League 1989/1990 Abstieg Gruppe A - Appearances as Referee | |
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| 28/04/1990 | FC Zürich | - | Servette FC | 1:2 | 4 | - | - |
| 26/05/1990 | Servette FC | - | AC Bellinzona | 2:1 | 1 | - | - |
| Complete name: | Serge Muhmenthaler |
| Born: | 20/05/1953 |
| Place of birth: |
Grenchen, 
Switzerland |
| Nationality: |
Switzerland |
| Bundesliga (GER) appearances: | 4 |