Novak Djokovic Stunned In 1st Round At U.S. Open After Battling Stomach Trouble

What happened
The 39-year-old Djokovic hadn’t lost in the first round of a major since early in his career, in 2006.
Summary assembled by rule from the sources below

The 39-year-old Djokovic hadn’t lost in the first round of a major since early in his career, in 2006.
Summary assembled by rule from the sources below