Presuming they are on their respective national teams, South Africa's Francois Louw and Hong Kong's Michael Mak would not be able to defend the 2018 United States Bowling Congress Open Championships doubles title they might have won on Thursday with 1,437. That’s due to the rules changes for the 2019 Open Championships announced March 23 and detailed in this story. USBC reported in this news release that the two traveled nearly 16,000 combined miles to make their debuts at the Open...