| Youth B Bundesliga Süd/Südwest 2007/2008 - Appearances as Referee |  |
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| 14/10/2007 | SG Rosenhöhe | - | Bayern München | 0:2 | 5 | - | - |
| 10/02/2008 | 1. FSV Mainz 05 | - | Jahn Regensburg | 4:1 | 2 | - | - |
| 29/03/2008 | Eintracht Frankfurt | - | TSV 1860 München | 3:0 | 3 | - | - |
| Youth B Bundesliga Süd/Südwest 2007/2008 - Appearances as Referee | |
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| 14/10/2007 | SG Rosenhöhe | - | Bayern München | 0:2 | 5 | - | - |
| 10/02/2008 | 1. FSV Mainz 05 | - | Jahn Regensburg | 4:1 | 2 | - | - |
| 29/03/2008 | Eintracht Frankfurt | - | TSV 1860 München | 3:0 | 3 | - | - |
| Complete name: | Thorben Siewer |
| Born: | 05/07/1987 |
| Place of birth: |
Germany |
| Residence: | Drolshagen |
| Nationality: |
Germany |
| Profession: | Controller |
| Club: | FC Schreibershof |