Determinative by themselves? No.
Even in soccer, one guy makes a diving save, or a tackle in the open field.
Yes, superficially a game can be decided on one shot or one play (hence, "game winners"). But realistically and actually, games are decided in the 100s of possessions that occur in the 48 (or, in the case of soccer, 90) minutes. We lost last night not because of the put-back dunk by itself, because we were sloppy with the ball.