NBA superstar Kevin Durant is betting on a Chicago sports gambling startup. Betsperts, a sports betting research tool that helps gamblers follow the picks of successful bettors, said Tuesday that Durant and fellow NBA All-Star Chris Paul have joined the company's $6 million Series A round it raised earlier this year. Durant has been one of the NBA's most active startup investors through his company Thirty Five Ventures, a New York-based VC fund that's invested in dozens of startups like Coinbase,...