| Challenger Rzym | 04/24 11:20 | 14 | [415] Francesco Vilardo v Otto Virtanen [371] | 1-6,1-6 | |
| Challenger Split | 04/17 08:00 | 14 | [316] Oriol Roca Batalla v Otto Virtanen [369] | 6-1,7-6 | |
| Challenger Lugano | 03/30 12:50 | 26 | [412] Otto Virtanen v Marius Copil [257] | 1-6,4-6 | |
| Challenger Lugano | 03/29 13:35 | 25 | Kilian Feldbausch v Otto Virtanen | 1-6,2-6 | |
| Challenger Lugano | 03/28 08:00 | 19 | [412] Otto Virtanen v Jakub Paul [449] | 0-6,6-4,7-6 | |
| Challenger Lugano | 03/27 08:00 | 14 | [301] Alexey Vatutin v Otto Virtanen [412] | 2-6,6-7 | |
| Challenger Biel | 03/24 11:25 | 26 | [292] Leandro Riedi v Otto Virtanen [412] | 6-4,6-4 | |
| Challenger Biel | 03/22 13:20 | 25 | [410] Otto Virtanen v Hiroki Moriya [261] | 7-6,6-4 | |
| Challenger Biel | 03/21 10:00 | 19 | [410] Otto Virtanen v David Poljak [382] | 7-6,6-3 | |
| Challenger Biel | 03/20 10:30 | 14 | [170] Ramkumar Ramanathan v Otto Virtanen [410] | 4-6,2-6 | |
| ITF - Trimbach M25 | 03/18 12:15 | 27 | Otto Virtanen v Johannes Haerteis | 4-6,6-4,4-6 | |
| ITF - Trimbach M25 | 03/17 09:00 | 26 | Otto Virtanen v Tim Handel | 6-3,6-4 | |
| ITF - Trimbach M25 | 03/16 09:00 | 25 | Otto Virtanen v Petr Nouza | 4-6,6-3,7-5 | |
| Puchar Davisa | 03/05 16:45 | 45 | [405] Otto Virtanen v Zizou Bergs [163] | 4-6,0-6 | |
| Puchar Davisa | 03/04 15:55 | 45 | [405] Otto Virtanen v David Goffin [68] | 5-7,6-3,3-6 | |
| Challenger Forli - Kwalifikacje | 02/20 08:30 | 14 | [228] Michael Mmoh v Otto Virtanen [358] | 4-6,6-3,6-2 | |
| ITF - Shrewsbury M25 | 02/08 11:30 | 25 | Otto Virtanen v Valentin Royer | 6-7,6-7 | |
| ITF - Vilnius M25 | 01/22 09:55 | 29 | Denis Yevseyev v Otto Virtanen | 5-7,6-3,7-6 | |
| ITF - Vilnius M25 | 01/21 12:00 | 28 | [451] David Poljak v Otto Virtanen [396] | 4-6,4-6 | |
| ITF - Vilnius M25 | 01/20 10:30 | 27 | Otto Virtanen v Henri Squire | 6-3,7-6 | |
| ITF - Vilnius M25 | 01/19 11:40 | 26 | Otto Virtanen v Aliaksandr Bulitski | 6-0,6-1 | |
| ITF - Vilnius M25 | 01/18 12:50 | 25 | Otto Virtanen v Michal Dembek | 6-1,6-2 | |
| Challenger Manama | 11/23 08:00 | 25 | [289] Hiroki Moriya v Otto Virtanen [388] | 6-3,6-2 | |
| Challenger Helsinki | 11/17 15:20 | 25 | [222] Ramkumar Ramanathan v Otto Virtanen [383] | 4-6,6-4,6-3 | |
| Challenger Eckental | 10/31 11:55 | 14 | [377] Otto Virtanen v Tobias Simon [460] | 1-6,4-6 | |
| Challenger Ismaning | 10/28 11:00 | 26 | [141] Maxime Cressy v Otto Virtanen [377] | 7-6,3-6,7-5 | |
| Challenger Ismaning | 10/26 15:10 | 25 | Otto Virtanen v Max Hans Rehberg | 7-5,6-2 | |
| Challenger Ismaning | 10/25 11:50 | - | [377] Otto Virtanen v Johannes Haerteis [427] | 4-6,6-3,6-3 | |
| Challenger Ismaning | 10/24 14:10 | 26 | [249] Nicola Kuhn v Otto Virtanen [367] | 2-6,6-2,1-6 | |
| ITF - Falun M25 | 09/29 12:20 | 26 | [419] Otto Virtanen v Maximilian Neuchrist [413] | 4-6,6-4,3-6 |
Wikipedia - Otto Virtanen
Otto Virtanen (ur. 21 czerwca 2001 w Hyvinkää) – fiński tenisista, zwycięzca juniorskiego Wimbledonu 2018 w grze podwójnej.