Twenty20 Blast Batting and Fielding Against Each Opponent by Kevin O'Brien
| Opponent | Matches | Inns | Not Out | Runs | HS | Ave | 100 | 50 | Ct | St |
| Derbyshire | 4 | 2 | 0 | 40 | 31 | 20.00 | 0 | 0 | 0 | |
| Durham | 4 | 4 | 1 | 78 | 48* | 26.00 | 0 | 0 | 2 | |
| Essex | 3 | 3 | 0 | 33 | 33 | 11.00 | 0 | 0 | 2 | |
| Glamorgan | 2 | 2 | 1 | 41 | 40* | 41.00 | 0 | 0 | 0 | |
| Gloucestershire | 1 | 1 | 0 | 8 | 8 | 8.00 | 0 | 0 | 0 | |
| Hampshire | 4 | 3 | 1 | 39 | 22 | 19.50 | 0 | 0 | 4 | |
| Kent | 4 | 3 | 1 | 79 | 43* | 39.50 | 0 | 0 | 0 | |
| Lancashire | 3 | 3 | 0 | 85 | 47 | 28.33 | 0 | 0 | 0 | |
| Leicestershire | 1 | 0 | | | | | | | 0 | |
| Middlesex | 4 | 4 | 2 | 235 | 119 | 117.50 | 1 | 2 | 5 | |
| Northamptonshire | 5 | 4 | 0 | 76 | 29 | 19.00 | 0 | 0 | 2 | |
| Nottinghamshire | 1 | 1 | 1 | 0 | 0* | | 0 | 0 | 0 | |
| Somerset | 3 | 3 | 0 | 41 | 34 | 13.66 | 0 | 0 | 1 | |
| Surrey | 2 | 2 | 0 | 31 | 24 | 15.50 | 0 | 0 | 0 | |
| Sussex | 4 | 3 | 0 | 18 | 14 | 6.00 | 0 | 0 | 2 | |
| Warwickshire | 3 | 3 | 1 | 14 | 11 | 7.00 | 0 | 0 | 1 | |
| Worcestershire | 3 | 2 | 0 | 34 | 22 | 17.00 | 0 | 0 | 3 | |
| Yorkshire | 3 | 3 | 1 | 34 | 21 | 17.00 | 0 | 0 | 1 | |