It's when somebody could be good at sports but they don't get to play and people make fun of them that there not starting. They could be on the bench slouched shoulders and not want to play the sport anymore. Even when there really good at the sport but to scared to play because he/she doesn't want to mess up.
He finally got his chance to play and he scored a touchdown. This is because he got the opportunity to play.
He came up with the huge touchdown for his team and he made his best of his opportunity. Now he is starting for his team for the rest of the year.