Even before Nick Johnson was carted off the field, the Nationals knew he was badly hurt. Johnson broke his right leg in an outfield collision during the eighth inning of the Mets' 12-6 victory over the Nationals on Saturday. The first baseman collided with right fielder Austin Kearns while chasing David Wright's blooper down the right-field line that fell in for a triple. Johnson was immobilized and taken to a hospital. He was scheduled to have surgery Saturday night in New York to repair his right femur, the bone in the upper part of his leg.