Monday was expected to be the day the U.S. Supreme Court would announce whether it will hear New Jersey’s years-long effort to legalize sports betting at casinos and racetracks. But a decision never came, either for or against the state. Now, experts say, the nation’s highest court could make an announcement Tuesday — though even that is uncertain. “This is the Groundhog Day of sports betting,” joked Daniel Wallach, a gaming and sports law attorney with Becker & Poliakoff in Fort Lauderdale, Fla. Set to take a summer recess, the Supreme Court discussed the case in a “cleanup conference” on...