Competition continues with triathlon events on Thursday CHICAGO -- The first day of world championship competition kicked off Wednesday in Grant Park with the ITU Aquathlon World Championships .
The Americans earned 10 world titles and a total of 24 medals in the swim - run event .
Competition continues with triathlon events on Thursday CHICAGO -- The first day of world championship competition kicked off Wednesday in Grant Park with the ITU Aquathlon World Championships , and the Americans earned 10 world titles and a total of 24 medals in the swim - run event .