which riders participated in the 2003 australian motorocycle grand prix?
roberto rolfo, anthony west, fonsi nieto, franco battaini, alex debon, naoki matsudo, erwan nigon, jaroslav hules, manuel poggiali, johann stigefelt, toni elias, lukas pesek, dirk heidolf, hugo marchand, chaz davies, hector faubel, henk vd lagemaat, joan olive, randy de puniet, christian gemmel, eric bataille, sebastian porto, katja poensgen, geoff hardcastle, alex baldolini, sylvain guintoli
of these, which placed in the top 15 positions?
roberto rolfo, anthony west, fonsi nieto, franco battaini, alex debon, naoki matsudo, erwan nigon, jaroslav hules, manuel poggiali, johann stigefelt, toni elias, lukas pesek, dirk heidolf, hugo marchand, chaz davies
of these, which rider only scored 1 point?
chaz davies