| 17 May 2018 | DER 357/8 v WAR 300Match · List A | Derbyshire won by 57 runs | Birmingham | Royal London One-Day Cup 2018 |
| 17 May 2018 | NOT 318 v LAN 309/9Match · List A | Nottinghamshire won by 9 runs | Manchester | Royal London One-Day Cup 2018 |
| 17 May 2018 | LEI 265/7 v NOR 193Match · List A | Leicestershire won by 72 runs | Northampton | Royal London One-Day Cup 2018 |
| 17 May 2018 | MID 250 v ESS 253/4Match · List A | Essex won by 6 wickets | Radlett | Royal London One-Day Cup 2018 |
| 17 May 2018 | KEN 188 v SUS 189/3Match · List A | Sussex won by 7 wickets | Brighton | Royal London One-Day Cup 2018 |
| 18 May 2018 | YOR 328/4 v DUR 186Match · List A | Yorkshire won by 142 runs | Chester-le-Street | Royal London One-Day Cup 2018 |
| 18 May 2018 | SUR 129 v SOM 131/2Match · List A | Somerset won by 8 wickets | London | Royal London One-Day Cup 2018 |
| 18 May 2018 | GLA 264 v GLO 265/2Match · List A | Gloucestershire won by 8 wickets | Cardiff | Royal London One-Day Cup 2018 |
| 19 May 2018 | WOR 323/6 v DER 273Match · List A | Worcestershire won by 50 runs | Worcester | Royal London One-Day Cup 2018 |
| 19 May 2018 | SUS 250 v HAM 253/8Match · List A | Hampshire won by 2 wickets | Brighton | Royal London One-Day Cup 2018 |
| 20 May 2018 | YOR 247/9 v WAR 248/5Match · List A | Warwickshire won by 5 wickets | Leeds | Royal London One-Day Cup 2018 |
| 20 May 2018 | LAN 314/7 v DUR 122Match · List A | Lancashire won by 192 runs | Manchester | Royal London One-Day Cup 2018 |
| 20 May 2018 | MID 313/9 v KEN 243Match · List A | Middlesex won by 70 runs | Radlett | Royal London One-Day Cup 2018 |
| 20 May 2018 | ESS 287/7 v GLO 289/6Match · List A | Gloucestershire won by 4 wickets | Bristol | Royal London One-Day Cup 2018 |
| 20 May 2018 | SOM 372/7 v GLA 289Match · List A | Somerset won by 83 runs | Taunton | Royal London One-Day Cup 2018 |
| 20 May 2018 | NOR 339/9 v NOT 290Match · List A | Northamptonshire won by 49 runs | Market Warsop | Royal London One-Day Cup 2018 |
| 21 May 2018 | SUR 262/7 v HAM 227/6Match · List A | Hampshire won by 4 wickets (DLS method) | Southampton | Royal London One-Day Cup 2018 |
| 22 May 2018 | SUS 341/7 v SOM 266Match · List A | Sussex won by 75 runs | Taunton | Royal London One-Day Cup 2018 |
| 23 May 2018 | ESS 303/6 v HAM 304/4Match · List A | Hampshire won by 6 wickets | Southampton | Royal London One-Day Cup 2018 |
| 23 May 2018 | WOR 350/6 v YOR 346/9Match · List A | Worcestershire won by 4 runs | Leeds | Royal London One-Day Cup 2018 |
| 23 May 2018 | GLO 282/6 v SUR 286/4Match · List A | Surrey won by 6 wickets | London | Royal London One-Day Cup 2018 |
| 23 May 2018 | LAN 279/8 v NOR 282/8Match · List A | Northamptonshire won by 2 wickets | Northampton | Royal London One-Day Cup 2018 |
| 23 May 2018 | MID 304/6 v GLA 302/9Match · List A | Middlesex won by 2 runs | Cardiff | Royal London One-Day Cup 2018 |
| 23 May 2018 | DUR 272/8 v DER 273/6Match · List A | Derbyshire won by 4 wickets | Derby | Royal London One-Day Cup 2018 |
| 23 May 2018 | NOT 409/7 v LEI 316/9Match · List A | Nottinghamshire won by 93 runs | Leicester | Royal London One-Day Cup 2018 |
| 25 May 2018 | LAN 50/1 v WARMatch · List A | No result | Blackpool | Royal London One-Day Cup 2018 |
| 25 May 2018 | GLA 274 v KEN 278/6Match · List A | Kent won by 4 wickets | Canterbury | Royal London One-Day Cup 2018 |
| 25 May 2018 | ESS 313 v SOM 273Match · List A | Essex won by 40 runs | Chelmsford | Royal London One-Day Cup 2018 |
| 25 May 2018 | DUR 209 v WOR 82/4Match · List A | Durham won by 9 runs (DLS method) | Gosforth | Royal London One-Day Cup 2018 |
| 25 May 2018 | MID 288/4 v SUS 214Match · List A | Middlesex won by 74 runs | Brighton | Royal London One-Day Cup 2018 |
| 25 May 2018 | DER 211/9 v LEI 206/7Match · List A | Derbyshire won by 5 runs | Derby | Royal London One-Day Cup 2018 |
| 27 May 2018 | KEN 296/4 v HAM 295/5Match · List A | Kent won by 1 run | Southampton | Royal London One-Day Cup 2018 |
| 27 May 2018 | ESS 294/9 v SUR 295/4Match · List A | Surrey won by 6 wickets | Chelmsford | Royal London One-Day Cup 2018 |
| 27 May 2018 | LAN 254/9 v WOR 255/7Match · List A | Worcestershire won by 3 wickets (DLS method) | Worcester | Royal London One-Day Cup 2018 |
| 27 May 2018 | DUR 256/7 v NOR 251/9Match · List A | Durham won by 5 runs | Northampton | Royal London One-Day Cup 2018 |
| 27 May 2018 | SOM 283 v MID 230Match · List A | Somerset won by 53 runs | Taunton | Royal London One-Day Cup 2018 |
| 27 May 2018 | LEI 293/9 v YOR 295/1Match · List A | Yorkshire won by 9 wickets | Leicester | Royal London One-Day Cup 2018 |
| 27 May 2018 | WAR 295/9 v NOT 187Match · List A | Warwickshire won by 108 runs | Nottingham | Royal London One-Day Cup 2018 |
| 29 May 2018 | SOM 221/9 v KEN 88/1Match · List A | Kent won by 28 runs (DLS method) | Canterbury | Royal London One-Day Cup 2018 |
| 29 May 2018 | LEI 376/4 v WOR 380/4Match · List A | Worcestershire won by 6 wickets | Worcester | Royal London One-Day Cup 2018 |
| 30 May 2018 | GLA 200 v ESS 201/1Match · List A | Essex won by 9 wickets | Chelmsford | Royal London One-Day Cup 2018 |
| 30 May 2018 | MID 199/8 v HAM 200/5Match · List A | Hampshire won by 5 wickets | Northwood | Royal London One-Day Cup 2018 |
| 30 May 2018 | DER 189/6 v YOR 192/8Match · List A | Yorkshire won by 2 wickets | Derby | Royal London One-Day Cup 2018 |
| 31 May 2018 | LEI 172 v LAN 175/1Match · List A | Lancashire won by 9 wickets | Oakham | Royal London One-Day Cup 2018 |
| 1 Jun 2018 | KEN 384/8 v SUR 164Match · List A | Kent won by 220 runs | Beckenham | Royal London One-Day Cup 2018 |
| 1 Jun 2018 | DUR 299/8 v WAR 300/5Match · List A | Warwickshire won by 5 wickets | Chester-le-Street | Royal London One-Day Cup 2018 |
| 1 Jun 2018 | DER 265/2 v NOR 214Match · List A | Derbyshire won by 51 runs | Northampton | Royal London One-Day Cup 2018 |
| 1 Jun 2018 | SUS 277/8 v GLA 281/4Match · List A | Glamorgan won by 6 wickets | Cardiff | Royal London One-Day Cup 2018 |
| 1 Jun 2018 | SOM 211 v GLO 39/0Match · List A | No result | Taunton | Royal London One-Day Cup 2018 |
| 1 Jun 2018 | NOT 202 v WOR 164Match · List A | Nottinghamshire won by 38 runs | Nottingham | Royal London One-Day Cup 2018 |