Stoner , who will be chasing his fifth win of the 2011 MotoGP Championship this Saturday , was 0.131 of a second behind Valentino Rossi .
Taking the third quickest time at FP1 in Assen was the series leader , Respol Honda 's Casey Stoner .
Casey Stoner , who will be chasing Casey Stoner 's fifth win of the 2011 MotoGP Championship this Saturday , was 0.131 of a second behind Valentino Rossi .
Taking the third quickest time at FP1 in Assen was the series leader , Respol Honda 's Casey Stoner .