| ITF M15 Alaminos-Larnaca | 04/24 07:00 | 44 | Samuele Pieri v Constantinos Papavasiliou | 6-0,6-2 | |
| ITF M25 Quinta Do Lago | 03/08 16:30 | 62 | Sean Hodkin v Constantinos Papavasiliou | 6-1,6-0 | |
| ITF M25 Quinta Do Lago | 03/07 13:55 | 62 | Duarte Correia v Constantinos Papavasiliou | 6-4,3-6,8-10 | |
| ITF M25 Setubal | 08/29 09:00 | 62 | Raphael Lambling v Constantinos Papavasiliou | 6-1,6-1 | |
| ITF M25 Setubal | 08/28 09:00 | 62 | Miguel Semedo v Constantinos Papavasiliou | 6-7,6-2,8-10 | |
| ITF M25 Santa Margherita | 04/24 12:00 | 54 | Raffael Schaer v Constantinos Papavasiliou | 6-2,6-1 | |
| ITF M25 Portimao | 03/06 10:30 | 62 | Constantinos Papavasiliou v Mario Mansilla Diez | 1-6,0-6 | |
| ITF M25 Faro | 02/27 12:45 | 62 | Jaime Faria v Constantinos Papavasiliou | 6-0,6-2 | |
| ITF M25 Vale Do Lobo | 02/20 15:15 | 62 | Constantinos Papavasiliou v Scott Duncan | 0-6,3-6 | |
| ITF M25 Cancun | 02/13 20:00 | 44 | Enzo Frances Tessari v Constantinos Papavasiliou | 6-0,6-1 | |
| ITF M15 Cancun | 01/17 15:00 | 44 | Andres Urrea v Constantinos Papavasiliou | 6-0,6-1 | |
| ITF M15 Cancun | 01/16 17:30 | 44 | Ricardo Reyna v Constantinos Papavasiliou | 3-6,2-6 | |
| ITF M15 Heraklion | 11/28 08:00 | 62 | Constantinos Papavasiliou v Andrei Cuceu | 2-6,7-5,6-10 | |
| ITF M15 Heraklion | 11/21 09:00 | 62 | Eduardo Cohen v Constantinos Papavasiliou | 7-5,6-2 | |
| ITF M15 Heraklion | 11/07 11:00 | 62 | Moritz Poswiat v Constantinos Papavasiliou | 7-5,6-1 | |
| ITF M15 Cancun | 10/10 21:00 | 44 | Constantinos Papavasiliou v Juan Sebastian Osorio | 0-6,1-6 | |
| ITF M25 Sintra | 09/12 12:00 | 62 | Constantinos Papavasiliou v Pedro D L R Bueno | 1-6,2-6 | |
| ITF M25 Sintra | 09/05 12:00 | 62 | Constantinos Papavasiliou v Martim Simoes | 1-6,3-6 | |
| ITF M15 Cairo | 01/10 14:00 | 62 | Babji Siva Atturu v Constantinos Papavasiliou | 6-1,5-7,10-5 | |
| ITF M15 Cancun | 12/08 14:00 | 44 | Constantinos Papavasiliou v Jack Vance | 1-6,4-6 | |
| ITF Turkey F41 | 12/17 09:30 | 62 | Constantinos Papavasiliou v Maximilien Sanson | Walkover | |
| ITF Turkey F38 | 11/24 09:30 | 44 | Constantinos Papavasiliou v Ivan Zaytsev | 6-1,5-7,6-7 | |
| ITF Greece F8 | 11/13 09:25 | 25 | Stefan Seifert v Constantinos Papavasiliou | 6-0,6-1 | |
| ITF Greece F7 | 11/03 07:30 | 62 | Constantinos Papavasiliou v Kenta Kurita | Retired | |
| ITF Ukraine F4 | 08/26 07:00 | 62 | Constantinos Papavasiliou v Oleksandr Varichenko | 0-6,3-6 | |
| ITF Germany F11 | 08/05 08:00 | 62 | Marvin Rehberg v Constantinos Papavasiliou | 6-1,6-2 | |
| ITF Germany F10 Qual | 07/29 10:30 | 62 | Constantinos Papavasiliou v Feda Bilic | 0-6,2-6 | |
| ITF Germany F9 | 07/30 13:30 | 62 | Constantinos Papavasiliou v Benjamin Loccisano | 0-6,2-6 | |
| ITF Romania F2 Qual | 05/20 09:00 | 62 | Constantinos Papavasiliou v Luca George Tatomir | 2-6,5-7 | |
| ITF Greece F4 | 03/25 09:30 | 62 | Liam Caruana v Constantinos Papavasiliou | 6-1,6-0 |