Sports Betting Firm in Canada Braces For Fight With DraftKings

With single-game sports betting about to go legit in Canada, the troika of DraftKings Inc., FanDuel Inc. and William Hill Plc that dominates the U.S. betting business is preparing to pounce.

But an entrepreneurial father-son team has something their would-be rivals don’t: a legion of fans that have made their mobile app, theScore, among the most popular sports apps in North America.

Shares of Toronto-based Score Media and Gaming Inc. surged after Canada unveiled legislation in November to legalize single-event sports betting, following in the footsteps of multiple U.S. states. The stock ended last year up 111% and jumped ...