If Japan proceeds to the Round of 16, its weakest link is their goalkeeper, as reflected by his not so good fundamental goalkeeping skills, such as not catching the ball with hands and chest, but he punched it in front of the opposing team forward, which led to Senegal's first goal. His failure to stand up rather than going on his knees, led to Sengal's second goal. With such a goalkeeper, I believe that it is unlikely that Japan will move to the quarter final.