Why does the Scorpions’ captain have a grudge against Mark?

Mark Conway is staying with his grandparents while his parents fight over whom he will live with after they divorce. He loves them, but it’s rough all the same. So the last thing he needs is the cold shoulder from the captain of his new soccer team, the Scorpions. But he’s coping with both situations just fine— or thinks he is, until one day he explodes with anger on the field….