| Uitslagen van interne ronde 28 | 12-04-2018 |
| Pieter Verhoef | Sander Berkhout | 1-0 |
| Ruud Verhoef | Jan Knuiman | ½-½ |
| Gerben Hendriks | Ruud Wille | ½-½ |
| Ronny Eggink | Hub Kusters | ½-½ |
| Jan Willem van Willigen | Lex van Hattum | ½-½ |
| Werner Passchier | Frans Veerman | ½-½ |
| Oscar Mercan | Peter Hamers | 1-0 |
| Hans Derendorp | Bram Hamers | 1-0 |
| Jan Ringoir | Kazem Mollahosseini | 0-1 |
| Theo van Lotringen | Erik Gort | 0-1 |
| Jan Sanders | Victor Droop | 0-1 |
| Cesar Eisma | Thijs Stomphorst | ½-½ |
| Werner Gubbels | Jan Diekema | 0-1 |
| Frans Berben | Phillip Stibbe | ½-½ |
| Clemens Wijman | Guido Burger | 1-0 |
| Geert Stradmeijer | Jan Zuidema | 1-0 |
| Beker | ||
| Jacques Boonstra | Tijs van Dijk | 1-0 |