| 1991-11-04 | Sao Paulo | Hard | R32 | 86 |  Andres Gomez (WC) | 55 |  Mark Koevermans | 6-1 6-3 | H2H | 3 | 60 | 4 | 1 | 47.5% | 89.5% | 71.4% | 0/0 |
| 1991-10-28 | Buzios | Hard | R32 | 35 |  Thomas Muster (4) | 56 | Mark Koevermans | 6-3 7-6(8) | H2H | 3 | 110 | 0 | 2 | 81.0% | 65.6% | 53.3% | 4/6 |
| 1991-10-21 | Stockholm Masters | Carpet | R64 | 129 |  Peter Lundgren (WC) | 56 | Mark Koevermans | 6-3 6-2 | H2H | 3 | 52 | 7 | 2 | 40.4% | 85.7% | 58.1% | 3/4 |
| 1991-10-07 | Tel Aviv | Hard | R32 | 186 | Jan Apell | 51 | Mark Koevermans (3) | 6-1 6-0 | H2H | 3 | 51 | 3 | 0 | 72.7% | 87.5% | 44.4% | 1/1 |
| 1991-09-30 | Athens | Clay | QF | 36 |  Jordi Arrese (8) | 46 | Mark Koevermans | 2-6 6-3 6-4 | H2H | 3 | 151 | 0 | 0 | 75.0% | 65.3% | 45.8% | 9/13 |
| 1991-09-30 | Athens | Clay | R16 | 46 | Mark Koevermans | 100 |  Markus Zoecke | 6-0 6-2 | H2H | 3 | 56 | 4 | 0 | 57.1% | 95.0% | 66.7% | 2/2 |
| 1991-09-30 | Athens | Clay | R32 | 46 | Mark Koevermans | 225 |  T.J. Middleton | 6-1 6-2 | H2H | 3 | 60 | 3 | 0 | 70.5% | 83.9% | 69.2% | 1/1 |
| 1991-09-20 | Davis Cup WG PO: MEX vs NED | Clay | RR | 44 | Mark Koevermans | 90 |  Luis Herrera | 6-3 6-4 6-4 | H2H | 5 | - | - | - | - | - | - | - |
| 1991-09-20 | Davis Cup WG PO: MEX vs NED | Clay | RR | 44 | Mark Koevermans | 211 | Leonardo Lavalle | 6-2 6-4 | H2H | 3 | - | - | - | - | - | - | - |
| 1991-08-26 | US Open | Hard | R128 | 121 | Jim Grabb | 41 | Mark Koevermans | 6-4 7-6(5) 6-2 | H2H | 5 | 136 | 8 | 2 | 62.8% | 74.6% | 57.1% | 2/4 |
