How do you say watching the game in spanish?

To answer this completely, a little context is necessary. Is this given as a command? WATCH THE GAME! or as a statement, "You watch the game every Saturday".

For the first, it is "Mire el juego". ("Mira el juego" for the informal). This is the "imperative" or command form of the verb "mirar".

For the second possibility, "Usted mira el juego todos los sábados" or "Miras el juego todos los sábados". Note here that the days of the week are not capitalized in Spanish.