I agree that NBA (basktball), baseball, and NFL (football) are among the most famous games. I also think that hockey, high school softball, wrestling and soccer are huge sports. Honestly it depends on where you are and what ages you are talking about because around me Football, baseball, basketball, hockey, and softball are among the most popular. If you go up north you may add hockey and if you go south football becomes even more profound. I have heard that UFC or WWF are big although I do not watch them.