When a fly ball rebounds off the fence and then touches a fielder's glove, how is it ruled?

When a fly ball rebounds off the fence, it is considered a boundary situation in baseball. The key here is that when the ball is in play and hits the fence, it may be subject to different rules regarding ground rules. If a ball that would have otherwise been a fair ball hits the fence and then touches a fielder's glove, it results in a ground-rule double because the ball has not been caught and remains in play, but the context of it being a rebound indicates that the runner(s) on base can advance a maximum of two bases.

A home run is ruled when the ball clears the outfield fence or wall without being touched, so that choice is not applicable here. A fair ball implies that the ball remains in field of play and is caught. Saying the play is treated as an error neglects the nature of the rebound, as there is no mistake by the fielder involved in this scenario; rather, it's a play governed by ground rule interpretations.

Thus, the correct ruling, based on the mechanics of the play when the ball rebounds off the fence and touches a fielder's glove, follows the ground-rule double ruling.