A World Health Organization report has found no adverse health outcomes but rather several medical applications for Cannabidiol, a.k.a. CBD, despite U.S. federal policy on this cannabinoid chemical. - Forbes
Because of playing sports or training, athletes get injured and develop inflammation. By taking CBD before the game, inflammation because of injuries sustained, can be reduced.
You need a clear mind when you play to win. Many pain killers, such as opioids, make you less focused which can create a problem when your focused on winning.