| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. M Ondrus vs M Olszewski |
| 0-1 | 63 | 2009 | 48th World Junior Championship | B90 Sicilian, Najdorf |
| 2. E Crespo vs M Ondrus |
| 1-0 | 35 | 2009 | 48th World Junior Championship | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 3. T Lehtimaki vs M Ondrus |
| 0-1 | 34 | 2009 | 48th World Junior Championship | B22 Sicilian, Alapin |
| 4. M Ondrus vs I Ocampos |
| 1-0 | 53 | 2009 | 48th World Junior Championship | B33 Sicilian |
| 5. M Ondrus vs B Chavarria |
| 1-0 | 41 | 2009 | 48th World Junior Championship | C77 Ruy Lopez |
| 6. A Diamant vs M Ondrus |
| 1-0 | 30 | 2009 | 48th World Junior Championship | B92 Sicilian, Najdorf, Opocensky Variation |
| 7. I Chirila vs M Ondrus |
| 1-0 | 39 | 2009 | 48th World Junior Championship | B97 Sicilian, Najdorf |
| 8. M Ondrus vs W Gryson |
| ½-½ | 20 | 2009 | 48th World Junior Championship | B06 Robatsch |
| 9. A Bomans vs M Ondrus |
| 0-1 | 12 | 2009 | 48th World Junior Championship | D11 Queen's Gambit Declined Slav |
| 10. M Ondrus vs F Perez Ponsa |
| 1-0 | 34 | 2009 | 48th World Junior Championship | B90 Sicilian, Najdorf |
| 11. M Ondrus vs I Nyzhnyk |
| 0-1 | 59 | 2010 | European Rapid Championship | B90 Sicilian, Najdorf |
| 12. P Anisimov vs M Ondrus |
| 1-0 | 60 | 2010 | European Rapid Championship | B20 Sicilian |
| 13. V Rasik vs M Ondrus |
| 1-0 | 29 | 2017 | Pankrac Cup | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 14. W Smieszek vs M Ondrus |
| 1-0 | 50 | 2017 | European Blitz Championship | B90 Sicilian, Najdorf |
| 15. M Ondrus vs W Smieszek |
| 0-1 | 39 | 2017 | European Blitz Championship | B27 Sicilian |
| 16. M Pena Gomez vs M Ondrus |
| 1-0 | 56 | 2017 | European Blitz Championship | A00 Uncommon Opening |
| 17. M Ondrus vs Y Malovanyi |
| 1-0 | 25 | 2017 | European Blitz Championship | B42 Sicilian, Kan |
| 18. Y Malovanyi vs M Ondrus |
| 0-1 | 25 | 2017 | European Blitz Championship | B42 Sicilian, Kan |
| 19. A Kislinsky vs M Ondrus |
| 1-0 | 63 | 2017 | European Blitz Championship | B22 Sicilian, Alapin |
| 20. M Ondrus vs A Kislinsky |
| 0-1 | 38 | 2017 | European Blitz Championship | B35 Sicilian, Accelerated Fianchetto, Modern Variation with Bc4 |
| 21. M Ondrus vs F Qorri |
| ½-½ | 55 | 2017 | European Blitz Championship | B32 Sicilian |
| 22. F Qorri vs M Ondrus |
| 1-0 | 37 | 2017 | European Blitz Championship | E76 King's Indian, Four Pawns Attack |
| 23. M Ondrus vs M Pena Gomez |
| 0-1 | 20 | 2017 | European Blitz Championship | B48 Sicilian, Taimanov Variation |
| 24. Mariusz Kowalczyk vs M Ondrus |
| 0-1 | 22 | 2017 | European Rapid Championship | B22 Sicilian, Alapin |
| 25. M Ondrus vs K Koziol |
| 1-0 | 80 | 2017 | European Rapid Championship | B90 Sicilian, Najdorf |
Kibitzing
