Japanese sumo wrestling popular bet at William Hill Todd Dewey, Las Vegas Review-Journal · March 23, 2020 at 3:17 pm Scanning the globe for sports betting content, William Hill sportsbook found a gem in Japanese sumo wrestling. The book took more than 1,000 bets on its Nevada mobile app on the final three days of matches at SUMO Haru Basho 2020, a professional sumo wrestling tournament that ended Sunday in Osaka. “We won a peanut to it. We wrote a few bets. So I guess, all in all, I’d have to give it a passing grade,” William Hill sportsbook director Nick Bogdanovich said. William Hill is based in London, where wagering on sumo wrestling also proved popular after the vast majority of the world’s sporting events were canceled or suspended because of the coronavirus pandemic.