| 257 runs | Surrey v Gloucestershire | The Brit Oval, Kennington | a18207 |
| 185 runs | Gloucestershire v Ireland | Castle Avenue, Dublin | a18223 |
| 143 runs | Durham v Worcestershire | Riverside Ground, Chester-le-Street | a18248 |
| 137 runs | Hampshire v Glamorgan | St Helen's, Swansea | a18249 |
| 135 runs | Essex v Hampshire | The Ford County Ground, Chelmsford | a18200 |
| 132 runs | Essex v Sussex | Arundel Castle Cricket Club Ground, Arundel | a18268 |
| 128 runs | Somerset v Ireland | County Ground, Taunton | a18213 |
| 125 runs | Durham v Hampshire | Lord's Cricket Ground, St John's Wood | a18334 |
| 122 runs | Worcestershire v Lancashire | Old Trafford, Manchester | a18190 |
| 122 runs | Nottinghamshire v Northamptonshire | County Ground, Northampton | a18204 |
| 112 runs | Kent v Sussex | County Ground, Hove | a18254 |