Head to Head
| BDO World Championship 2019 | 2018/02/04 14:57 | William O'Connor v Jelle Klaasen | 5-1 |
Home History
| European Tour 2 | 2023/03/26 13:30 | Rob Cross v William O'Connor | 6-1 |
| European Tour 2 | 2023/03/25 21:00 | Martin Schindler v William O'Connor | 0-6 |
| European Tour 2 | 2023/03/24 12:00 | William O'Connor v Marko Kantele | 6-3 |
| Players Championship 7 | 2023/03/19 13:05 | Jamie Hughes v William O'Connor | 3-6 |
| UK Open 2023 | 2023/03/04 20:00 | William O'Connor v Adam Gawlas | 3-10 |
| UK Open 2023 | 2023/03/04 12:55 | William O'Connor v Danny Noppert | 10-9 |
| UK Open 2023 | 2023/03/03 20:25 | William O'Connor v Jermaine Wattimena | 10-1 |
| UK Open 2023 | 2023/03/03 14:50 | William O'Connor v Devon Petersen | 6-2 |
Away History
| Players Championship 8 | 2023/03/20 13:35 | Gary Anderson v Jelle Klaasen | 6-4 |
| UK Open 2023 | 2023/03/03 19:55 | Luke Woodhouse v Jelle Klaasen | 10-2 |
| UK Open 2023 | 2023/03/03 15:50 | Scott Williams v Jelle Klaasen | 5-6 |
| UK Open 2023 | 2023/03/03 13:55 | Jelle Klaasen v Ricardo Pietreczko | 6-1 |
| UK Open 2023 | 2023/03/03 12:20 | Jelle Klaasen v Josh Payne | 6-2 |
| Modus Super Series Week 3 | 2023/02/25 23:00 | Jack Main v Jelle Klaasen | 3-4 |
| Modus Super Series Week 3 | 2023/02/25 22:35 | Ryan Furness v Jelle Klaasen | 2-4 |
| Modus Super Series Week 3 | 2023/02/25 21:05 | Dom Taylor v Jelle Klaasen | 4-3 |