"Obviously they’ll need a little more trial and error. But it’s a good idea,” said Drew Gilbert, who initiated the very first challenge.

Drew Gilbert became the first player to challenge a check swing call in the Arizona Fall League, and the Mets top prospect drew a walk after winning his appeal.

There's no indication of if and/or when the automated check-swing challenge will make its way to the regular season and up to the majors. ( MLB continues to experiment with the automated ball-strike system in the minor leagues, with commissioner Rob Manfred suggesting it could be introduced down the road in MLB using a similar challenge system .)

The Arizona Fall League is upon us, and in this circuit of elite prospects, there is something to watch for every night. Here's what's on the docket for the second week of the campaign.