250cc GP Race Results From Assen: 1. Sebastian PORTO, Aprilia, 18 laps, 38:02.148 2. Daniel PEDROSA, Honda, -0.381 second 3. Jorge LORENZO, Honda, -1.232 seconds 4. Hiroshi AOYAMA, Honda, -11.757 seconds 5. Alex DE ANGELIS, Aprilia, -12.017 seconds 6. Casey STONER, Aprilia, -12.026 seconds 7. Andrea DOVIZIOSO, Honda, -12.354 seconds 8. Randy DE PUNIET, Aprilia, -13.935 seconds 9. Hector BARBERA, Honda, -14.406 seconds 10. Simone CORSI, Aprilia, -29.294 seconds 11. Roberto LOCATELLI, Aprilia, -53.684 seconds 12. Sylvain GUINTOLI, Aprilia, -55.365 seconds 13. Alex DEBON, Honda, -55.366 seconds 14. Chaz DAVIES, Aprilia, -55.627 seconds 15. Yuki TAKAHASHI, Honda, -55.913 seconds 26. Alex BALDOLINI, Aprilia, -6 laps, mechanical 27. Anthony WEST, Honda, -6 laps, mechanical 28. Steve JENKNER, Aprilia, -15 laps, crash