Is a 10x zoom camera enough for watching sports games? I mean from the seats behind the football field.

It should be said that this 10x optical zoom is not enough. Generally, professional sports photography uses a telephoto lens of f=400mm or above to take pictures of football fields on the sidelines. Only with such a telephoto lens and at a certain distance (on the sidelines, closer to the players) can the players' faces be clearly captured. However, if you are sitting in the back row of the stadium, to achieve the effect of clearly photographing people's faces, you may need a lens with f=800mm or above, and this kind of lens is not affordable for ordinary consumers. From the back row of the stadium, you can only take a panoramic view of the stadium. It is very difficult to take pictures of the players.