| Jul 2, 2026 | Gamback | ½–½ | Mueller | Round 7: Gamback, Bjorn - Mueller, Thomas | French Defense: Advance Variation, Nimzowitsch System | |
| Jul 1, 2026 | Mueller | ½–½ | Goldinger | Round 6: Mueller, Thomas - Goldinger, Peter | Grünfeld Defense: Three Knights Variation, Hungarian Attack | |
| Jun 30, 2026 | Toenniges | ½–½ | Mueller | Round 5: Toenniges, Thomas - Mueller, Thomas | French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation | |
| Jun 29, 2026 | Pfrommer | * | Mueller | Round 4: Pfrommer, Martin - Mueller, Thomas | ? | |
| Jun 28, 2026 | Mueller | ½–½ | Schiff | Round 3: Mueller, Thomas - Schiff, Armin | Queen's Indian Defense: Classical Variation, Traditional Variation, Nimzowitsch Line | |
| Jun 28, 2026 | Kurpiela | * | Mueller | Round 3: Kurpiela, Franz - Mueller, Thomas | ? | |
| Jun 22, 2026 | Mueller | ½–½ | Podat | Round 1: Mueller, Thomas - Podat, Vladimir | Grünfeld Defense: Three Knights Variation, Hungarian Attack | |
| Oct 15, 2025 | Scheuermann | 1–0 | Mueller | 33. offene S?chsische Senioren-Einzelmeisterschaft | French Defense: Tarrasch Variation, Chistyakov Defense, Modern Line | |
| Aug 31, 2024 | Heller | ½–½ | Mueller | Round 9: Heller, Achim - Mueller, Thomas | Slav Defense: Quiet Variation | |
| Aug 29, 2024 | Paris | 1–0 | Mueller | Round 7: Paris, Michael - Mueller, Thomas | French Defense: Winawer Variation, Advance Variation | |
| Aug 28, 2024 | Mueller | ½–½ | Jurisic | Round 6: Mueller, Thomas - Jurisic, Zlatko | Benoni Defense: Old Benoni | |
| Aug 23, 2024 | Mueller | 0–1 | Becker | Round 1: Mueller, Thomas - Becker, Michael | Indian Defense: Spielmann-Indian | |
| Jul 5, 2024 | Mueller | ½–½ | Schiff | 9. offene Baden-W?rttembergische Senioren-Einzelmeisterschaft | Queen's Pawn Game | |
| Oct 25, 2023 | Mantovani | * | Mueller | 50+ World Senior Championship | ? | |