| 2025-09-12 | Davis Cup WG1 R1: BUL vs FIN | Clay | RR | 992 |  Alexander Vasilev | 141 |  Otto Virtanen | 6-3 7-5 | H2H | 3 | 110 | 0 | 7 | 65.3% | 70.2% | 52.0% | 3/5 |
| 2025-06-09 | 's-Hertogenbosch | Grass | R32 | 101 | Otto Virtanen (WC) | 62 |  Tomas Martin Etcheverry | 7-6(6) 7-5 | H2H | 3 | 143 | 7 | 3 | 58.4% | 77.8% | 43.8% | 1/4 |
| 2025-05-05 | Rome Masters | Clay | R64 | 9 |  Lorenzo Musetti (8) | 130 | Otto Virtanen (Q) | 6-3 6-2 | H2H | 3 | 85 | 1 | 1 | 69.8% | 81.1% | 56.3% | 0/0 |
| 2025-05-05 | Rome Masters | Clay | R128 | 130 | Otto Virtanen (Q) | 72 |  Hamad Medjedovic | 6-4 6-4 | H2H | 3 | 99 | 8 | 3 | 49.4% | 66.7% | 62.5% | 8/9 |
| 2025-03-31 | Marrakech | Clay | R16 | 51 |  Roberto Carballes Baena (5) | 135 | Otto Virtanen | 6-4 6-4 | H2H | 3 | 80 | 1 | 0 | 77.6% | 66.7% | 61.5% | 2/4 |
| 2025-03-31 | Marrakech | Clay | R32 | 135 | Otto Virtanen | 83 |  Daniel Altmaier | 6-2 4-6 7-6(3) | H2H | 3 | 149 | 5 | 6 | 59.6% | 71.4% | 60.5% | 1/3 |
| 2025-02-17 | Doha | Hard | R32 | 39 |  Nuno Borges | 92 | Otto Virtanen (LL) | 7-6(6) 6-3 | H2H | 3 | 82 | 3 | 0 | 79.7% | 72.7% | 35.7% | 1/3 |
| 2025-02-10 | Marseille | Hard | R16 | 80 | Daniel Altmaier | 98 | Otto Virtanen | 6-4 6-3 | H2H | 3 | 87 | 9 | 0 | 54.8% | 72.5% | 51.5% | 10/11 |
| 2025-02-10 | Marseille | Hard | R32 | 98 | Otto Virtanen | 23 |  Sebastian Korda (5) | 6-7(3) 7-6(4) 6-4 | H2H | 3 | 152 | 19 | 4 | 60.0% | 76.4% | 47.9% | 6/8 |
| 2025-01-31 | Davis Cup QLS R1: AUT vs FIN | Hard | RR | 219 |  Lukas Neumayer | 97 | Otto Virtanen | 6-4 6-7(4) 6-3 | H2H | 3 | - | - | - | - | - | - | - |
