They are joined by the likes of Dirk van Duijvenbode, Maik Kuivenhoven and Kim Huybrechts in the line-up for Mannheim with a further qualifier also on the agenda today for the International Darts Open in Riesa.
De Zwaan saw off Zoran Lerchbacher followed by Jose de Sousa in a good performance from 'The Black Cobra' in a tough qualification route. Hopp saw off Jose Justicia before defeating Raymond van Barneveld who of course is attempting to qualify for the World Championship in his final year.
Clemens had to play three games in comparison in the form of Jelle Klaasen in a tight 6-5 win, Geert Nentjes in a 6-1 win before edging out Ron Meulenkamp in a 6-4 win.
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Last 48
Christian Bunse 6 | 1 Vincent Kamphuis
Dirk van Duijvenbode 6 | 3 Mike van Duivenbode
Cristo Reyes 6 | 5 Ronny Huybrechts
Jose De Sousa 6 | 4 Toni Alcinas
Darius Labanauskas 6 | 2 Mario Robbe
Maik Kuivenhoven 6 | 4 Marko Kantele
Dimitri Van den Bergh 6 | 0 Christian Kist
Raymond van Barneveld 6 | 4 Benito van de Pas
Kim Huybrechts 6 | 2 Rowby-John Rodriguez
Tytus Kanik 6 | 5 Yordi Meeuwisse
Martin Schindler 6 | 2 Jan Dekker
Davy Van Baelen 6 | 4 Robert Marijanovic
Geert Nentjes 6 | 5 Vincent Van der Meer
Gabriel Clemens 6 | 5 Jelle Klaasen
Last 24
Jermaine Wattimena 6 | 1 Niels Zonneveld
Dirk van Duijvenbode 6 | 4 Christian Bunse
Jeffrey De Zwaan 6 | 3 Zoran Lerchbacher
Jose De Sousa 6 | 5 Cristo Reyes
Danny Noppert 6 | 4 Madars Razma
Maik Kuivenhoven 6 | 5 Darius Labanauskas
Max Hopp 6 | 4 Jose Justicia
Raymond van Barneveld 6 | 5 Dimitri Van den Bergh
Kim Huybrechts 6 | 2 Vincent van der Voort
Martin Schindler 6 | 4 Tytus Kanik
Ron Meulenkamp 6 | 5 Davy Van Baelen
Gabriel Clemens 6 | 1 Geert Nentjes
Last 12
Dirk van Duijvenbode 6 | 5 Jermaine Wattimena
Jeffrey De Zwaan 6 | 2 Jose De Sousa
Danny Noppert 5 | 6 Maik Kuivenhoven
Max Hopp 6 | 4 Raymond van Barneveld
Kim Huybrechts 6 | 4 Martin Schindler
Gabriel Clemens 6 | 4 Ron Meulenkamp