DYERSVILLE, Iowa (AP) — Spurred by a voice telling him, "If you build it, he will come," the Iowa farmer played by Kevin Costner dutifully carved a baseball field out of his cornfield and then watched as Shoeless Joe Jackson and his Chicago White Sox teammates strode out of the stalks and onto the Field of Dreams.

Major League Baseball is building another field a few hundred yards down a corn-lined path from the famous movie site in eastern Iowa but unlike the original, it's unclear whether teams will show up for a game this time as the league and its players struggle to agree on plans for a c...