An initial public sale of tickets to the 123rd U.S. Open Championship to be played at Los Angeles Country Club next June will be held Monday starting at 10 a.m. ET, the United States Golf Association has announced. Fans can enter the online waiting room at usopen.com up to 30 minutes ahead of the on-sale window. There is no benefit to entering the waiting room earlier, the USGA said. The sale will include gallery tickets as well as upgraded ticket packages, Monday through Wednesday practice rounds, in addition to Thursday to Sunday championship rounds. The Open will be played June…