International Twenty20 Batting and Fielding Against Each Opponent by Kevin O'Brien
| Opponent | Matches | Inns | Not Out | Runs | HS | Ave | 100 | 50 | Ct | St |
| Afghanistan | 18 | 18 | 0 | 271 | 74 | 15.05 | 0 | 1 | 5 | |
| Australia | 1 | 1 | 0 | 35 | 35 | 35.00 | 0 | 0 | 1 | |
| Bangladesh | 5 | 4 | 1 | 44 | 39* | 14.66 | 0 | 0 | 1 | |
| Bermuda | 1 | 1 | 0 | 6 | 6 | 6.00 | 0 | 0 | 0 | |
| Canada | 4 | 3 | 0 | 40 | 31 | 13.33 | 0 | 0 | 2 | |
| England | 1 | 0 | | | | | | | 0 | |
| Hong Kong | 4 | 4 | 0 | 161 | 124 | 40.25 | 1 | 0 | 2 | |
| India | 3 | 3 | 0 | 12 | 10 | 4.00 | 0 | 0 | 2 | |
| Jersey | 1 | 1 | 0 | 11 | 11 | 11.00 | 0 | 0 | 1 | |
| Kenya | 5 | 4 | 2 | 60 | 30* | 30.00 | 0 | 0 | 1 | |
| Namibia | 2 | 2 | 0 | 42 | 25 | 21.00 | 0 | 0 | 3 | |
| Nepal | 2 | 2 | 1 | 6 | 5 | 6.00 | 0 | 0 | 3 | |
| Netherlands | 13 | 12 | 2 | 254 | 46 | 25.40 | 0 | 0 | 5 | |
| New Zealand | 1 | 1 | 0 | 2 | 2 | 2.00 | 0 | 0 | 1 | |
| Nigeria | 1 | 1 | 0 | 32 | 32 | 32.00 | 0 | 0 | 0 | |
| Oman | 4 | 4 | 0 | 113 | 41 | 28.25 | 0 | 0 | 3 | |
| Pakistan | 1 | 1 | 0 | 26 | 26 | 26.00 | 0 | 0 | 0 | |
| Papua New Guinea | 3 | 3 | 1 | 23 | 19* | 11.50 | 0 | 0 | 0 | |
| Scotland | 13 | 11 | 2 | 305 | 65 | 33.88 | 0 | 2 | 3 | |
| South Africa | 3 | 3 | 0 | 2 | 2 | 0.66 | 0 | 0 | 0 | |
| Sri Lanka | 2 | 2 | 0 | 5 | 5 | 2.50 | 0 | 0 | 0 | |
| United Arab Emirates | 7 | 7 | 0 | 189 | 54 | 27.00 | 0 | 1 | 3 | |
| West Indies | 7 | 7 | 1 | 128 | 48 | 21.33 | 0 | 0 | 2 | |
| Zimbabwe | 8 | 8 | 0 | 206 | 60 | 25.75 | 0 | 1 | 2 | |