That helped make up for the Bulls and Blackhawks missing the postseason, lowering interest in both the NBA and NHL playoffs." $482.5 million, or 95.1%, of May's bets were made online. DraftKings/Casino Queen rocketed back into the market lead with $170.1 million in combined online and retail handle, up from $169.6 million. May's handle included $166.2 million in online bets and led to $7.2 million in gross gaming revenue. FanDuel/Fairmont's online and retail sportsbooks attracted $156.3 million in bets in May, down from $177.8 million in April. But the month's bets, $155.6 million of which came online, generated a whopping $20.2 million in gross gaming revenue. BetRivers/Rivers Casino rose to $89 million in combined handle, including $76.7 million in online wagering. That led to $5.2 million in gross gaming revenue. The leaders were followed by: The market could get more competition in the coming months, too.