The deal follows private equity business Platinum Equity recently acquiring a controlling interest in GameTaco.
While terms of the deal were not disclosed, funding both from Platinum and from FanDuel board member David Nathanson helped facilitate the deal.
Nathanson will serve as executive chairman of the new combined business, with GameTaco chief executive Joshua Barrow continuing in his post. Matt Turetzky, general manager of WorldWinner, will continue to oversee the brand under the GameTaco umbrella.