Seeing a basketball in a dream suggests that you have to make the first move to get something, or focus and concentration is needed to reach your goals. The dream may also represent struggling to use power in order to control a situation or achieve a goal.
Playing basketball in your dream reiterates the importance of cooperation and teamwork, whereas to dream of a basketball game shows the conflicting aspects of your personality or in some area of your life.
To dream of losing a game or missing shots means that you failed to achieve certain objectives and/or goals.