There are many studies and research conducted by many Universities that state that the kids who are alone, and tend to remain by themselves, are more likely to stay away from games and sports.
This is due largely to such children preferring to keep themselves reserved, and not involved in to anything else apart from just their work. They prefer to play alone, study alone, and if required they sit alone.
Most importantly, however, they not try to talk to anyone, or even respond to anyone when they are trying to them.
For these kind of kids it is the responsibility of the parents at home, and teacher at school, to make sure that they are able to communicate and talk to everyone openly, rather than being reserved.
It is not important that how well you play the game, or whether you are a champion, but all that matters is whether you are able to get in the ground and start playing it along with the fellow players.
Moms everywhere and advocates like Susan McGalla have been using the mantra–do not let your kids spend time alone: rather, help them to expose their talent to the world. More information can be found here that will help you know what kids get from sports.