| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Bacrot vs D Mastrovasilis |
 | 1-0 | 39 |
1992 |
Wch U10 | E85 King's Indian, Samisch, Orthodox Variation |
| 2. A Ulmanis vs D Mastrovasilis |
| 0-1 | 31 |
1992 |
European Youth Chess | C30 King's Gambit Declined |
| 3. Chilingirova vs D Mastrovasilis |
| 1-0 | 21 |
1992 |
Komotini Open | E70 King's Indian |
| 4. R Memekidou vs D Mastrovasilis |
| 0-1 | 17 |
1993 |
Komotini GP | A00 Uncommon Opening |
| 5. D Mastrovasilis vs Bacrot |
| ½-½ | 15 |
1993 |
EU-ch U10 | B01 Scandinavian |
| 6. Bacrot vs D Mastrovasilis |
| 1-0 | 66 |
1993 |
Wch U10 | D09 Queen's Gambit Declined, Albin Counter Gambit, 5.g3 |
| 7. Aronian vs D Mastrovasilis |
 | 0-1 | 16 |
1994 |
EU-ch U12 | B80 Sicilian, Scheveningen |
| 8. Akobian vs D Mastrovasilis |
| ½-½ | 51 |
1994 |
EU-ch U12 | E99 King's Indian, Orthodox, Taimanov |
| 9. Grischuk vs D Mastrovasilis |
| 1-0 | 29 |
1995 |
EU-ch U12 | B42 Sicilian, Kan |
| 10. D Mastrovasilis vs A Wirig |
| 1-0 | 43 |
1995 |
EU-ch U12 | B01 Scandinavian |
| 11. Akobian vs D Mastrovasilis |
 | ½-½ | 22 |
1996 |
Wch U14 | D45 Queen's Gambit Declined Semi-Slav |
| 12. Akobian vs D Mastrovasilis |
| 1-0 | 90 |
1996 |
EU-ch U14 | D00 Queen's Pawn Game |
| 13. K Rusev vs D Mastrovasilis |
| 0-1 | 39 |
1997 |
Wch U14 | D02 Queen's Pawn Game |
| 14. I Nikolaidis vs D Mastrovasilis |
| 1-0 | 33 |
1998 |
48th Greek Championships | D31 Queen's Gambit Declined |
| 15. I Dorfanis vs D Mastrovasilis |
| 0-1 | 36 |
1998 |
GRE-chT | D10 Queen's Gambit Declined Slav |
| 16. I Papaioannou vs D Mastrovasilis |
| 1-0 | 77 |
1998 |
48th Greek Championships | D30 Queen's Gambit Declined |
| 17. E Grivas vs D Mastrovasilis |
| 0-1 | 57 |
1998 |
48th Greek Championships | A11 English, Caro-Kann Defensive System |
| 18. D Mastrovasilis vs C Lutz |
 | 0-1 | 35 |
1999 |
GRE-GER m | B90 Sicilian, Najdorf |
| 19. Jobava vs D Mastrovasilis |
| 1-0 | 30 |
1999 |
Wch U16 | D31 Queen's Gambit Declined |
| 20. D Mastrovasilis vs Akobian |
| ½-½ | 11 |
1999 |
EU-ch U16 | B01 Scandinavian |
| 21. Yusupov vs D Mastrovasilis |
| 1-0 | 68 |
1999 |
GRE-GER m | D31 Queen's Gambit Declined |
| 22. D Mastrovasilis vs Navara |
| ½-½ | 67 |
1999 |
Groningen Young Masters | C11 French |
| 23. D Mastrovasilis vs Radjabov |
| 0-1 | 40 |
2000 |
EU-ch U20 | C11 French |
| 24. D Mastrovasilis vs S Halkias |
| 0-1 | 32 |
2000 |
Greek Chess Championship | B33 Sicilian |
| 25. I Nikolaidis vs D Mastrovasilis |
| ½-½ | 6 |
2000 |
Greek Chess Championship | D11 Queen's Gambit Declined Slav |