| Futures 2025 | Round | Result | H | A | 
		
			| 15.10. |  | Nikles J. - Kountourakis I. | 1R | 6-1, 66-7, 7-63 | 1.06 | 7.81 | 
		
			| 08.10. |  | Loureiro J. - Kountourakis I. | 1R | 7-5, 3-6, 6-3 |  |  | 
		
			| 07.10. |  | Crisostomo G. - Kountourakis I. | Q-R16 | 6-2, 6-3 |  |  | 
		
			| 05.10. |  | Kountourakis I. - Brun T. | Q-2R | 6-2, 6-1 |  |  | 
		
			| UTR Pro Tennis Series 5 | Round | Result | H | A | 
		
			| 21.09. |  | Dhoe B. - Kountourakis I. |  | 3-6, 6-4, 7-5 | 1.48 | 2.39 | 
		
			| 20.09. |  | Kountourakis I. - Maute J. |  | 6-2, 6-4 | 2.73 | 1.36 | 
		
			| 19.09. |  | Kountourakis I. - Kos D. |  | 6-1, 6-2 | 1.10 | 5.25 | 
		
			| 18.09. |  | Kountourakis I. - Polichronopoulos A. |  | 6-1, 6-0 | 1.01 | 9.00 | 
		
			| 17.09. |  | Kountourakis I. - Bianchi J. |  | 6-4, 6-3 | 1.30 | 3.00 | 
		
			| 15.09. |  | Salazar D. - Kountourakis I. |  | 6-1, 6-4 | 1.15 | 4.35 | 
		
			| Hersonissos 4 challenger | Round | Result | H | A | 
		
			| 17.08. |  | Potenza L. - Kountourakis I. | Q-1R | 6-2, 6-0 | 1.11 | 5.90 | 
		
			| Hersonissos 3 challenger | Round | Result | H | A | 
		
			| 10.08. |  | Kimhi O. - Kountourakis I. | Q-1R | 6-2, 6-3 | 1.26 | 3.66 | 
		
			| Futures 2025 | Round | Result | H | A | 
		
			| 28.07. |  | Ponchet M. - Kountourakis I. | Q-R16 | 6-3, 7-5 | 2.08 | 1.66 | 
		
			| 27.07. |  | Kountourakis I. - Wiger Nordas B. | Q-1R | 7-5, 3-6, 11-9 |  |  | 
		
			| 15.07. |  | Caripi V. - Kountourakis I. | 1R | 3-6, 6-4, 7-67 | 8.47 | 1.04 | 
		
			| 09.07. |  | Covato M. - Kountourakis I. | 1R | 7-5, 7-64 | 2.31 | 1.55 | 
		
			| 02.07. |  | Ouakaa A. - Kountourakis I. | 1R | 7-63, 7-64 | 1.14 | 5.00 | 
		
			| 11.06. |  | Falabella L. - Kountourakis I. | 1R | 6-3, 6-2 |  |  | 
		
			| 10.06. |  | Scomparin P. - Kountourakis I. | Q-R16 | 6-2, 65-7, 10-6 | 2.38 | 1.49 | 
		
			| 09.06. |  | Kountourakis I. - Lulic N. | Q-2R | 6-0, 6-4 |  |  | 
		
			| 08.06. |  | Kountourakis I. - Ortiz Gamonal D. | Q-1R | 7-6, 6-2 |  |  | 
		
			| 05.06. |  | Gagliardo L. - Kountourakis I. | R16 | 6-2, 6-2 | 1.22 | 3.93 | 
		
			| 04.06. |  | Kountourakis I. - Todorovic L. | 1R | 4-6, 6-4, 6-2 | 1.16 | 4.57 | 
		
			| 02.06. |  | Kountourakis I. - Stepanov T. | Q-R16 | 6-4, 6-4 |  |  | 
		
			| 02.06. |  | Kountourakis I. - Rudan Z. | Q-2R | 6-4, 6-2 |  |  | 
		
			| 28.05. |  | Kirkin E. - Kountourakis I. | 1R | 7-63, 6-4 | 1.10 | 6.01 | 
		
			| 09.05. |  | Tsitsipas P. - Kountourakis I. | QF | 7-66, 6-4 | 1.55 | 2.30 | 
		
			| 08.05. |  | Kountourakis I. - Purtseladze S. | R16 |  | 7.50 | 1.07 | 
		
			| 07.05. |  | Kountourakis I. - Host T. | 1R | 7-5, 6-4 | 1.94 | 1.77 | 
		
			| 01.04. |  | Guna R. - Kountourakis I. | Q-R16 | 6-1, 5-7, 10-8 |  |  | 
		
			| 31.03. |  | Kountourakis I. - Brun T. | Q-2R | 6-1, 6-2 |  |  | 
		
			| 30.03. |  | Kountourakis I. - O'Brien J. | Q-1R | 6-3, 6-3 |  |  | 
		
			| 24.03. |  | Ion N. - Kountourakis I. | Q-2R | 7-6, 6-4 |  |  | 
		
			| 23.03. |  | Kountourakis I. - Strauch V. | Q-1R | 6-2, 6-2 |  |  | 
		
			| 20.03. |  | Kuhar M. - Kountourakis I. | R16 | 6-1, 6-3 | 1.35 | 2.98 | 
		
			| 19.03. |  | Kountourakis I. - Horoz A. | 1R | 7-65, 3-6, 6-2 | 1.49 | 2.46 | 
		
			| Hersonissos 2 challenger | Round | Result | H | A | 
		
			| 09.03. |  | Serafini M. - Kountourakis I. | Q-1R | 6-1, 6-2 | 1.32 | 3.21 | 
		
			| Futures 2025 | Round | Result | H | A | 
		
			| 27.02. |  | Cina F. - Kountourakis I. | R16 | 6-3, 6-4 | 1.05 | 8.11 | 
		
			| 26.02. |  | Kountourakis I. - Derepasko T. | 1R | 7-67, 6-3 |  |  | 
		
			| 25.02. |  | Kountourakis I. - Seleznev B. | Q-R16 | 7-60, 6-3 | 1.10 | 5.83 | 
		
			| 24.02. |  | Kountourakis I. - Sborowsky Y. | Q-2R | 6-2, 4-6, 10-7 |  |  | 
		
			| 22.02. |  | Kountourakis I. - Vidunov A. | Q-1R | 6-0, 6-0 |  |  | 
		
			| 17.02. |  | Malesevic N. - Kountourakis I. | Q-2R | 6-4, 6-3 |  |  | 
		
			| 16.02. |  | Kountourakis I. - Nicolle C. | Q-1R | 6-3, 6-1 |  |  | 
		
			| 11.02. |  | Yamanaka T. - Kountourakis I. | Q-R16 | 61-7, 6-4, 10-4 | 1.44 | 2.62 | 
		
			| 10.02. |  | Kountourakis I. - Dubrouski M. | Q-2R | 6-0, 3-6, 10-6 |  |  | 
		
			| 09.02. |  | Kountourakis I. - Shibano K. | Q-1R | 6-4, 5-7, 10-8 |  |  | 
		
			| 05.02. |  | Balshaw F. - Kountourakis I. | 1R | 7-64, 63-7, 6-3 | 1.24 | 3.74 | 
		
			| 04.02. |  | Kountourakis I. - Rivera L. | Q-R16 | 6-2, 6-4 | 1.67 | 2.10 | 
		
			| 03.02. |  | Kountourakis I. - Lomakin G. | Q-2R | 7-6, 6-4 |  |  | 
		
			| 02.02. |  | Kountourakis I. - Pavlov V. | Q-1R | 6-2, 7-5 |  |  |