Full free practice (1) results from the fourth round of the 2009 World Supersport Championship at Assen, Netherlands.

1. Joan Lascorz ESP Kawasaki Provec Motocard.com ZX-6R 1min 41.650s
2. Cal Crutchlow GBR Yamaha SSP YZF R6 1min 41.869s
3. Michele Pirro ITA Yamaha Lorenzini by Leoni YZF R6 1min 42.081s
4. Eugene Laverty IRL Parkalgar Honda CBR600RR 1min 42.164s
5. Garry McCoy AUS Triumph BE1 Racing 675 1min 42.168s
6. Anthony West AUS Stiggy Motorsport Honda CBR600RR 1min 42.427s
7. Kenan Sofuoglu TUR HANNspree Ten Kate Honda CBR600RR 1min 42.428s
8. Barry Veneman NED Hoegee Suzuki GSX-R 600 1min 42.490s
9. Andrew Pitt AUS HANNspree Ten Kate Honda CBR600RR 1min 42.655s
10. Mark Aitchison AUS HANNspree Althea Honda CBR600RR 1min 42.659s
11. Fabien Foret FRA Yamaha SSP YZF R6 1min 42.688s
12. Matthieu Lagrive FRA HANNspree Althea Honda CBR600RR 1min 42.738s
13. Gianluca Nannelli ITA Triumph BE1 Racing 675 1min 43.021s
14. Miguel Praia POR Parkalgar Honda CBR600RR 1min 43.032s
15. Robbin Harms DEN Veidec Racing RES Honda CBR600RR 1min 43.090s
16. Gianluca Vizziello ITA Stiggy Motorsport Honda CBR600RR 1min 43.324s
17. Katsuaki Fujiwara JPN Kawasaki Provec Motocard.com ZX-6R 1min 43.390s
18. Alessandro Polita ITA Hoegee Suzuki GSX-R 600 1min 43.507s
19. Massimo Roccoli ITA Intermoto Czech Honda CBR600RR 1min 43.545s
20. Matej Smrz CZE Factory Racing Triumph 675 1min 43.766s
21. Arie Vos NED Veidec Racing RES Honda CBR600RR 1min 44.105s
22. Jesco Gunther GER RES Software Veidec Racing 1min 44.274s
23. Patrick Vostarek CZE Intermoto Czech Honda CBR600RR 1min 44.705s
24. Daniel Dell'Omo ITA Kuja Racing 1mins 44.895s
25. Russell Holland AUS ECHO CRS Grand Prix Honda CBR600RR 1min 45.087s
26. Marcel Van Nieuwenhuizen NED Sterken Racing Honda CBR600RR 1min 45.536s
27. Kevin Bos NED VD Sleen/Heyden Yamaha YZF R6 1min 45.830s
28. Fabrizio Lai ITA ECHO CRS Grand Prix Honda CBR600RR 1min 46.008s
29. Doni Tata Pradita INA YZF Yamaha R6 1min 46.010s
30. Yannick Guerra ESP Holiday Gym Racing Yamaha YZF R6 1min 46.280s
31. Twan Van Poppel NED Holiday Gym Yamaha YZF R6 1min 46.579s