Starting second on the grid behind polesitter Tadasuke Makino, Lawson passed the Dandelion driver shortly after the pitstop phase to take the lead before marching to a comfortable 4.4s victory.
With Ritomo Miyata finishing only third and Tomoki Nojiri having an uninspiring race en route to eighth, Lawson sits just one point adrift of his TOM'S rivals in the standings with just three races left to run across Motegi and Suzuka.
