Since you asked, my two cents is not to approach the coach at all. He has already communicated to your son with the lineup card. Your son knows exactly what it will take to get back into the lineup. Hit and field better. Your son already has had 10 opportunities to communicate with the coach. Encourage him to use his production to communicate his desire for more playing time. Last year was last year. He needs to focus on those things under his control (his attitude and effort) and let everything else go that is out of his control (coaches decisions). There is no entitlement in this game no matter how well last year went.