| 1991-07-29 | Kitzbuhel | Clay | R64 | 106 |  Diego Nargiso | 156 |  Aki Rahunen | 6-2 6-2 | H2H | 3 | 60 | 4 | 1 | 50.0% | 90.0% | 65.0% | 1/2 |
| 1991-07-08 | Bastad | Clay | R32 | 64 |  Christian Bergstrom | 137 | Aki Rahunen | 6-1 6-2 | H2H | 3 | 65 | 0 | 0 | 60.0% | 81.5% | 55.6% | 0/0 |
| 1991-06-24 | Wimbledon | Grass | R128 | 98 |  Patrik Kuhnen | 135 | Aki Rahunen | 6-3 6-3 6-4 | H2H | 5 | 106 | 11 | 7 | 56.8% | 84.8% | 60.0% | 1/2 |
| 1991-06-10 | Florence | Clay | R32 | 44 |  Fabrice Santoro (8) | 90 | Aki Rahunen | 6-3 6-2 | H2H | 3 | 65 | 0 | 2 | 48.9% | 87.0% | 54.2% | 2/3 |
| 1991-05-27 | Roland Garros | Clay | R128 | 77 | Thierry Champion | 88 | Aki Rahunen | 7-6(4) 7-5 1-6 6-1 | H2H | 5 | 140 | 8 | 0 | 58.3% | 75.0% | 40.0% | 4/9 |
| 1991-05-13 | Umag | Clay | R32 | 120 | Tarik Benhabiles | 82 | Aki Rahunen | 1-6 6-3 6-2 | H2H | 3 | 98 | 1 | 4 | 45.6% | 69.4% | 51.2% | 5/8 |
| 1991-05-03 | Davis Cup G1 SF: FIN vs DEN | Hard | RR | 229 |  Frederik Fetterlein | 83 | Aki Rahunen | 6-4 6-0 6-3 | H2H | 5 | - | - | - | - | - | - | - |
| 1991-05-03 | Davis Cup G1 SF: FIN vs DEN | Hard | RR | 83 | Aki Rahunen | 494 | Morten Christensen | 6-4 6-4 6-1 | H2H | 5 | - | - | - | - | - | - | - |
| 1991-04-15 | Nice | Clay | R32 | 63 |  Horacio de la Pena | 81 | Aki Rahunen | 6-3 6-2 | H2H | 3 | 82 | 0 | 1 | 51.6% | 54.5% | 74.2% | 6/7 |
| 1991-04-08 | Barcelona | Clay | R64 | 86 | Aki Rahunen | 109 |  Joao Cunha-Silva | 6-4 6-4 | H2H | 3 | 105 | 0 | 1 | 74.6% | 72.3% | 68.8% | 4/4 |
