| 2004-10-11 | Moscow | Carpet | R32 | 168 |  Vladimir Voltchkov (Q) | 102 |  Gilles Elseneer | 6-2 7-6(1) | H2H | 3 | 83 | 6 | 1 | 57.6% | 76.5% | 64.0% | 0/1 |
| 2004-09-24 | Davis Cup WG PO: CRO vs BEL | Carpet | RR | 103 | Gilles Elseneer | 25 |  Mario Ancic | 7-6(4) 2-1 RET | H2H | 5 | - | - | - | - | - | - | - |
| 2004-09-24 | Davis Cup WG PO: CRO vs BEL | Carpet | RR | 27 | Ivan Ljubicic | 103 | Gilles Elseneer | 7-6(6) 7-5 6-4 | H2H | 5 | - | - | - | - | - | - | - |
| 2004-09-13 | Delray Beach | Hard | R32 | 100 |  Ricardo Mello | 104 | Gilles Elseneer | 6-1 6-4 | H2H | 3 | 68 | 3 | 1 | 66.7% | 67.5% | 60.0% | 8/9 |
| 2004-08-30 | US Open | Hard | R128 | 56 |  Michael Llodra | 108 | Gilles Elseneer | 2-6 7-6(2) 7-6(5) 6-2 | H2H | 5 | 161 | 7 | 7 | 63.7% | 73.3% | 57.1% | 7/10 |
| 2004-08-16 | Washington | Hard | R16 | 64 | Cyril Saulnier (7) | 109 | Gilles Elseneer | 6-3 7-6(2) | H2H | 3 | 98 | 8 | 0 | 47.2% | 82.4% | 65.8% | 2/2 |
| 2004-08-16 | Washington | Hard | R32 | 109 | Gilles Elseneer | 174 |  Jimmy Wang (Q) | 2-6 7-6(1) 6-4 | H2H | 3 | 115 | 7 | 6 | 60.0% | 64.8% | 69.4% | 4/7 |
| 2004-07-19 | Indianapolis | Hard | R64 | 154 | Julien Jeanpierre (LL) | 104 | Gilles Elseneer | 6-3 3-6 6-3 | H2H | 3 | 90 | 7 | 2 | 68.8% | 77.4% | 58.3% | 0/1 |
| 2004-07-12 | Los Angeles | Hard | R16 | 18 |  Mardy Fish (3) | 97 | Gilles Elseneer | 6-2 3-6 6-3 | H2H | 3 | 86 | 9 | 4 | 58.3% | 78.6% | 56.7% | 3/4 |
| 2004-07-12 | Los Angeles | Hard | R32 | 97 | Gilles Elseneer | 233 | Brian Vahaly (Q) | 2-6 6-4 7-5 | H2H | 3 | 104 | 8 | 8 | 55.1% | 79.1% | 42.9% | 4/9 |
