Despite its role as a development car, the MS9 was entered into the 1968 South African Grand Prix, as the MS10 was deemed to be not ready. Still in its pale green primer coat, Jackie Stewart was immediately comfortable with the car and eventually qualified third on the grid behind the Lotus 49s of Jim Clark and Graham Hill. The intense heat at Kyalami led to cooling problems, and the nose-cone off the car was widened to improve airflow. An additional radiator was also fitted at the rear of the car. In the race itself, Stewart beat the Lotuses at the start but was soon overtaken by Clark and then some time later by Hill. Just after half-distance a broken connecting-rod punched through the side of the engine and the new car's race, and its racing career, was over.