| 2021-11-08 | Stockholm | Hard | R32 | 62 |  Pedro Martinez | 79 |  Emil Ruusuvuori | 6-4 3-6 7-6(4) | H2H | 3 | 181 | 0 | 6 | 58.3% | 68.3% | 46.7% | 6/9 |
| 2021-10-25 | St. Petersburg | Hard | R32 | 28 |  Taylor Fritz (5) | 72 | Emil Ruusuvuori (Q) | 6-1 6-4 | H2H | 3 | 67 | 11 | 0 | 59.3% | 82.9% | 41.7% | 5/6 |
| 2021-10-04 | Indian Wells Masters | Hard | R64 | 29 |  Karen Khachanov (24) | 78 | Emil Ruusuvuori | 6-2 7-5 | H2H | 3 | 96 | 4 | 5 | 58.0% | 72.5% | 55.2% | 4/5 |
| 2021-10-04 | Indian Wells Masters | Hard | R128 | 78 | Emil Ruusuvuori | 65 |  Dominik Koepfer | 6-7(3) 6-2 6-0 | H2H | 3 | 134 | 2 | 7 | 60.7% | 64.8% | 54.3% | 9/11 |
| 2021-09-27 | Sofia | Hard | R32 | 56 |  James Duckworth | 79 | Emil Ruusuvuori | 3-6 6-4 6-4 | H2H | 3 | 144 | 11 | 6 | 58.8% | 73.3% | 35.7% | 4/8 |
| 2021-09-20 | Nur-Sultan | Hard | QF | 52 |  Ilya Ivashka (8) | 84 | Emil Ruusuvuori | 4-6 6-4 6-1 | H2H | 3 | 170 | 4 | 3 | 64.6% | 72.6% | 29.4% | 8/11 |
| 2021-09-20 | Nur-Sultan | Hard | R16 | 84 | Emil Ruusuvuori | 25 | Aslan Karatsev (1) | 7-6(6) 6-4 | H2H | 3 | 119 | 2 | 3 | 64.5% | 75.5% | 51.9% | 5/8 |
| 2021-09-20 | Nur-Sultan | Hard | R32 | 84 | Emil Ruusuvuori | 61 |  Benjamin Bonzi | 6-2 RET | H2H | 3 | 31 | 2 | 0 | 83.3% | 86.7% | 100.0% | 0/0 |
| 2021-09-17 | Davis Cup WG1 R1: IND vs FIN | Hard | RR | 74 | Emil Ruusuvuori | 187 |  Ramkumar Ramanathan | 6-4 7-5 | H2H | 3 | 95 | 2 | 3 | 55.7% | 73.5% | 55.6% | 1/3 |
| 2021-08-30 | US Open | Hard | R64 | 21 | Roberto Bautista Agut (18) | 66 | Emil Ruusuvuori | 6-1 6-3 6-2 | H2H | 5 | 101 | 1 | 2 | 68.7% | 67.4% | 71.4% | 3/5 |
