| 102 runs | Northamptonshire v Surrey | Edgbaston, Birmingham | tt3805 |
| 86 runs | Surrey v Middlesex | Lord's Cricket Ground, St John's Wood | tt3749 |
| 79 runs | Leicestershire v Derbyshire | County Ground, Derby | tt3750 |
| 76 runs | Durham v Yorkshire | Emirates Durham International Cricket Ground, Chester-le-Street | tt3700 |
| 64 runs | Somerset v Glamorgan | County Ground, Taunton | tt3726 |
| 62 runs | Essex v Kent | The Essex County Ground, Chelmsford | tt3694 |
| 62 runs | Hampshire v Kent | Spitfire Ground, St Lawrence, Canterbury | tt3763 |
| 61 runs | Surrey v Essex | The Essex County Ground, Chelmsford | tt3768 |
| 60 runs | Nottinghamshire v Lancashire | Trent Bridge, Nottingham | tt3761 |
| 58 runs | Glamorgan v Worcestershire | County Ground, New Road, Worcester | tt3660 |