Fair ball

In baseball, a fair ball is a batted ball that has not yet become a foul ball, and that...

settles on fair ground between home and first base, or between home and third base, or
is on or over fair territory when bounding to the outfield past first or third base, or
touches first, second, or third base, or
touches the person of an umpire or player while the ball is on or over fair ground, or
passes out of the playing field in flight while over fair ground, or
touches any part of the fair pole, including an attached screen, in flight.

It is possible for a ball moving in foul territory to become a fair ball. Batted balls can also be foul balls or foul tips.

On a fair ball, the ball is alive; runners attempt to advance and fielders try to record outs. A batted ball is presumed to be fair until it is ruled a foul ball or a foul tip.

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