'Batman v Superman' nabs box-office record for best pre-summer debut

In the cinematic battle between two of the world's greatest superheroes, the true winner is Warner Bros., whose "Batman v Superman: Dawn of Justice" now holds the record for largest pre-summer debut. Grossing a whopping estimated $170.1 million in the U.S. and Canada, the film bests the former record holder, 2012's "The Hunger Games," which had a $152.2 million March opening. …