| 214 runs | Northamptonshire v Middlesex | Lord's Cricket Ground, St John's Wood | a14452 |
| 175 runs | Somerset v Durham | County Ground, Taunton | a14579 |
| 165 runs | Kent v Durham | Mote Park, Maidstone | a14394 |
| 135 runs | Yorkshire v Somerset | North Marine Road, Scarborough | a14409 |
| 132 runs | Kent v Nottinghamshire | Trent Bridge, Nottingham | a14350 |
| 127 runs | Worcestershire v Somerset | County Ground, New Road, Worcester | a14299 |
| 126 runs | Kent v Somerset | St Lawrence Ground, Canterbury | a14450 |
| 121 runs | Worcestershire v Durham | Riverside Ground, Chester-le-Street | a14346 |
| 118 runs | Somerset v Kent | County Ground, Taunton | a14538 |
| 107 runs | Somerset v Glamorgan | Sophia Gardens, Cardiff | a14431 |
| 103 runs | Glamorgan v Worcestershire | Sophia Gardens, Cardiff | a14526 |
| 102 runs | Northamptonshire v Surrey | Whitgift School, Croydon | a14433 |