| 2012-09-14 | Davis Cup WG PO: CAN vs RSA | Hard | RR | 15 |  Milos Raonic | 188 |  Izak Van der Merwe | 6-2 6-2 6-4 | H2H | 5 | - | - | - | - | - | - | - |
| 2012-09-14 | Davis Cup WG PO: CAN vs RSA | Hard | RR | 116 | Vasek Pospisil | 188 | Izak Van der Merwe | 6-3 6-4 6-4 | H2H | 5 | - | - | - | - | - | - | - |
| 2012-07-09 | Newport | Grass | QF | 11 |  John Isner (1) | 155 | Izak Van der Merwe (Q) | 6-4 7-6(2) | H2H | 3 | 83 | 12 | 2 | 71.6% | 85.4% | 52.6% | 2/2 |
| 2012-07-09 | Newport | Grass | R16 | 155 | Izak Van der Merwe (Q) | 345 | Jack Sock (WC) | 6-4 6-4 | H2H | 3 | 96 | 9 | 2 | 50.9% | 92.6% | 61.5% | 2/2 |
| 2012-07-09 | Newport | Grass | R32 | 155 | Izak Van der Merwe (Q) | 61 |  Gilles Muller (8) | 7-6(5) 6-7(3) 6-4 | H2H | 3 | 140 | 7 | 5 | 56.2% | 81.4% | 60.9% | 2/3 |
| 2012-04-06 | Davis Cup G1 R2: RSA vs SLO | Hard | RR | 126 | Izak Van der Merwe | 128 | SLOGrega Zemlja | 6-1 3-6 6-3 6-4 | H2H | 5 | - | - | - | - | - | - | - |
| 2012-04-06 | Davis Cup G1 R2: RSA vs SLO | Hard | RR | 126 | Izak Van der Merwe | 109 | SLOBlaz Kavcic | 7-6(3) 6-4 6-4 | H2H | 5 | - | - | - | - | - | - | - |
| 2012-02-13 | San Jose | Hard | R32 | 89 |  Tobias Kamke | 129 | Izak Van der Merwe | 6-3 6-3 | H2H | 3 | 76 | 1 | 2 | 63.8% | 64.9% | 71.4% | 2/3 |
| 2012-01-30 | Zagreb | Hard | R32 | 93 | Matthias Bachinger | 118 | Izak Van der Merwe | 6-3 6-3 | H2H | 3 | 88 | 6 | 1 | 68.6% | 77.1% | 68.8% | 5/5 |
| 2011-09-16 | Davis Cup WG PO: RSA vs CRO | Hard | RR | 26 |  Marin Cilic | 128 | Izak Van der Merwe | 6-0 6-0 RET | H2H | 5 | - | - | - | - | - | - | - |
