The official site of US Open is chicagomarathon.com . 24 (from 5 confederations) teams participated in US Open . The no. of events in sport was 18 . The venue for US Open was Georgia Dome,New York City, New York,,United States . 11 from 2 nations were the competitors in US Open . 1884; 135 years ago (1884) is when US Open was established 
The sport US Open has more than6 contestants  from more than 0 nations