ODI Batting and Fielding Against Each Opponent by Kevin O'Brien
| Opponent | Matches | Inns | Not Out | Runs | HS | Ave | 100 | 50 | Ct | St |
| Afghanistan | 26 | 25 | 3 | 603 | 75 | 27.40 | 0 | 2 | 13 | |
| Australia | 4 | 3 | 0 | 44 | 23 | 14.66 | 0 | 0 | 0 | |
| Bangladesh | 10 | 9 | 1 | 179 | 48 | 22.37 | 0 | 0 | 1 | |
| Bermuda | 1 | 1 | 0 | 54 | 54 | 54.00 | 0 | 1 | 1 | |
| Canada | 8 | 7 | 2 | 272 | 89* | 54.40 | 0 | 2 | 6 | |
| England | 13 | 12 | 1 | 285 | 113 | 25.90 | 1 | 0 | 9 | |
| India | 3 | 3 | 0 | 13 | 9 | 4.33 | 0 | 0 | 0 | |
| Kenya | 8 | 7 | 0 | 310 | 142 | 44.28 | 1 | 1 | 4 | |
| Netherlands | 11 | 9 | 1 | 138 | 34 | 17.25 | 0 | 0 | 4 | |
| New Zealand | 2 | 2 | 0 | 50 | 49 | 25.00 | 0 | 0 | 1 | |
| Pakistan | 7 | 7 | 2 | 172 | 84* | 34.40 | 0 | 1 | 4 | |
| Papua New Guinea | 1 | 1 | 0 | 12 | 12 | 12.00 | 0 | 0 | 0 | |
| Scotland | 18 | 15 | 5 | 455 | 98* | 45.50 | 0 | 3 | 6 | |
| South Africa | 4 | 4 | 0 | 114 | 48 | 28.50 | 0 | 0 | 2 | |
| Sri Lanka | 4 | 4 | 0 | 78 | 64 | 19.50 | 0 | 1 | 3 | |
| United Arab Emirates | 8 | 7 | 1 | 227 | 69 | 37.83 | 0 | 3 | 4 | |
| West Indies | 12 | 12 | 0 | 348 | 68 | 29.00 | 0 | 3 | 4 | |
| Zimbabwe | 13 | 13 | 2 | 265 | 73* | 24.09 | 0 | 1 | 5 | |