List A Bowling Against Each Opponent by Iain O'Brien
| Opponent | Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ |
| Auckland | 403 | 5 | 307 | 8 | 3-46 | 38.37 | 0 | 0 | 50.37 | 4.57 |
| Australia | 270 | 2 | 253 | 10 | 3-68 | 25.30 | 0 | 0 | 27.00 | 5.62 |
| Canterbury | 384 | 4 | 280 | 6 | 2-45 | 46.66 | 0 | 0 | 64.00 | 4.37 |
| Central Districts | 444 | 5 | 311 | 20 | 5-35 | 15.55 | 1 | 2 | 22.20 | 4.20 |
| Derbyshire | 48 | 0 | 33 | 0 | | | | | | 4.12 |
| England | 36 | 0 | 59 | 1 | 1-59 | 59.00 | 0 | 0 | 36.00 | 9.83 |
| Glamorgan | 48 | 0 | 31 | 1 | 1-31 | 31.00 | 0 | 0 | 48.00 | 3.87 |
| Hampshire | 115 | 2 | 99 | 2 | 2-32 | 49.50 | 0 | 0 | 57.50 | 5.16 |
| India | 147 | 1 | 176 | 3 | 2-43 | 58.66 | 0 | 0 | 49.00 | 7.18 |
| Ireland | 42 | 0 | 36 | 2 | 2-36 | 18.00 | 0 | 0 | 21.00 | 5.14 |
| Northamptonshire | 46 | 1 | 47 | 4 | 4-41 | 11.75 | 1 | 0 | 11.50 | 6.13 |
| Northern Districts | 306 | 3 | 221 | 11 | 3-39 | 20.09 | 0 | 0 | 27.81 | 4.33 |
| Nottinghamshire | 39 | 1 | 38 | 2 | 2-38 | 19.00 | 0 | 0 | 19.50 | 5.84 |
| Otago | 281 | 4 | 244 | 3 | 1-24 | 81.33 | 0 | 0 | 93.66 | 5.20 |
| South Africa A | 77 | 0 | 74 | 1 | 1-50 | 74.00 | 0 | 0 | 77.00 | 5.76 |
| Sri Lanka A | 84 | 0 | 84 | 0 | | | | | | 6.00 |
| Sri Lanka Under-23s | 48 | 0 | 39 | 1 | 1-39 | 39.00 | 0 | 0 | 48.00 | 4.87 |