| Result | Tournament |
|---|---|
| Nguyen Phuc Long defeated Cliff Castelein | 2019 Dynamic Billard Leende Open 9-Ball |
| Cliff Castelein defeated Eirik Riisnæs | 2019 Dynamic Billard Leende Open 9-Ball |
| Cliff Castelein defeated Pijus Labutis | 2019 Dynamic Billard Leende Open 9-Ball |
| Mats Schjetne defeated Cliff Castelein | 2019 Dynamic Billard Leende Open 9-Ball |
| Eklent KaCi defeated Cliff Castelein | 2018 Dynamic Billard Veldhoven Open 9-Ball |
| Konrad Juszczyszyn defeated Cliff Castelein | 2018 Dynamic Billard Veldhoven Open 9-Ball |
| Cliff Castelein defeated Stephan Weihnacht | 2018 Dynamic Billard Veldhoven Open 9-Ball |
| Cliff Castelein defeated Pierfrancesco Garzia | 2018 Dynamic Billard Veldhoven Open 9-Ball |
| Cliff Castelein defeated Ralf Zigahn | 2018 Dynamic Billard Veldhoven Open 9-Ball |
| Roman Hybler defeated Cliff Castelein | 2018 Dynamic Billard St. Johann im Pongau Open 9-Ball |
| Cliff Castelein defeated Jani Siekkinen | 2018 Dynamic Billard St. Johann im Pongau Open 9-Ball |
| Cliff Castelein defeated Matthias Suranyi | 2018 Dynamic Billard St. Johann im Pongau Open 9-Ball |
| Mariusz Skoneczny defeated Cliff Castelein | 2018 Dynamic Billard St. Johann im Pongau Open 9-Ball |
| Cliff Castelein defeated Imran Majid | 2018 Dynamic Billard St. Johann im Pongau Open 9-Ball |
| Cliff Castelein defeated Marton Keidl | 2018 Dynamic Billard St. Johann im Pongau Open 9-Ball |
| Mark Gray defeated Cliff Castelein | 2018 Dynamic Billard Leende Open 9-Ball |
| Cliff Castelein defeated Denis Grabe | 2018 Dynamic Billard Leende Open 9-Ball |
| Sergey Lutsker defeated Cliff Castelein | 2018 Dynamic Billard Leende Open 9-Ball |
| Cliff Castelein defeated Stephan Weihnacht | 2018 Dynamic Billard Leende Open 9-Ball |
| Mariusz Skoneczny defeated Cliff Castelein | 2018 Dynamic Billard Klagenfurt Open 9-Ball |
| Roberto Bartol defeated Cliff Castelein | 2018 Dynamic Billard Klagenfurt Open 9-Ball |
| Francisco Diaz-Pizarro defeated Cliff Castelein | 2018 Dynamic Billard BHR Treviso Open 9-Ball |
| Cliff Castelein defeated Albert Casellas-Planas | 2018 Dynamic Billard BHR Treviso Open 9-Ball |
| Cliff Castelein defeated Jani Siekkinen | 2018 Dynamic Billard BHR Treviso Open 9-Ball |
| Cliff Castelein defeated Konrad Juszczyszyn | 2018 Dynamic Billard BHR Treviso Open 9-Ball |
| Cliff Castelein defeated Javier Del Santo-Sanz | 2018 Dynamic Billard BHR Treviso Open 9-Ball |
| Damianos Yiallourakis defeated Cliff Castelein | 2016 EuroTour Billard Treviso Open 9-Ball |
| Cliff Castelein defeated Javier Del Santo-Sanz | 2016 EuroTour Billard Treviso Open 9-Ball |
| Francisco Diaz-Pizarro defeated Cliff Castelein | 2016 EuroTour Billard Treviso Open 9-Ball |
| Cliff Castelein defeated Angelo Salzano | 2016 EuroTour Billard Treviso Open 9-Ball |
| Andrey Seroshtan defeated Cliff Castelein | 2016 EuroTour Billard Dutch Open 9-Ball |
| Cliff Castelein defeated Kristjan Kuusik | 2016 EuroTour Billard Dutch Open 9-Ball |
| Nikos Ekonomopoulos defeated Cliff Castelein | 2016 EuroTour Billard Dutch Open 9-Ball |
| Cliff Castelein defeated Theodore Thomas | 2016 EuroTour Billard Dutch Open 9-Ball |
| Dimitri Jungo defeated Cliff Castelein | 2015 EuroTour Billard Portugal Open 9-Ball |
| Mark Gray defeated Cliff Castelein | 2015 EuroTour Billard Portugal Open 9-Ball |
| Cliff Castelein defeated Juha Mallinen | 2015 EuroTour Billard Portugal Open 9-Ball |
| Cliff Castelein defeated So Shaw | 2015 EuroTour Billard Portugal Open 9-Ball |
| Andreas Koukiadakis defeated Cliff Castelein | 2014 EuroTour Austria Open 9-Ball |
| Cliff Castelein defeated Philipp Caranica | 2014 EuroTour Austria Open 9-Ball |
| Mario He defeated Cliff Castelein | 2014 EuroTour Austria Open 9-Ball |
| Cliff Castelein defeated Bjorn Lepke | 2014 EuroTour Austria Open 9-Ball |
| Abbas Al-Marayati defeated Cliff Castelein | 2013 EuroTour Italy Open 9-Ball |
| Cliff Castelein defeated Roger Lysholm | 2013 EuroTour Italy Open 9-Ball |
| Cliff Castelein defeated Jonni Fulcher | 2013 EuroTour Italy Open 9-Ball |
| David Alcaide defeated Cliff Castelein | 2013 EuroTour Italy Open 9-Ball |
| Cliff Castelein defeated Henrikas Strolis | 2013 EuroTour Italy Open 9-Ball |
| Cliff Castelein defeated Serge Das | 2012 EuroTour Austria Open 9-Ball |
| Cliff Castelein defeated Jalo Kotinurmi | 2012 EuroTour Austria Open 9-Ball |
| Kristof de Bruyn defeated Cliff Castelein | 2011 PTC - Event 9 Snooker |