Possession (sports) determined by several methods, including a coin flip (American football and cricket), home team status (baseball), or by giving the teams an equal opportunity to physically take possession; this may be called a dropped-ball (association football), a ball-up (Australian rules football), a jump ball (basketball), or a face-off (hockey). In some timed sports, the team with possession may try to "run time off the clock" by keeping the ball and not attempting to score, in order to deny the opposing team possession. A shot clock speeds gameplay by requiring teams to attempt to score within a certain period of time
Comparison of American and Canadian football to require that it legally start a new play before the play clock expires, and can award possession to the defending team if another time count is committed. Moreover, in any quarter, when the game clock expires while the ball is dead in Canadian football, a final play must by run with "zeros on the clock" before the quarter ends, whereas in American football the expiration of time while the ball is dead immediately ends the quarter (including overtime periods in such cases where those periods are timed) - in American football, it is common (or even, arguably, expected) for