International Math Olympiads (IMO) 2017 was held in Brazil between July 12th and 23rd. USA Team ranked 4th place this year after South Korea (1st), China (2nd), and Vietnam (3rd).
USA team won 3 Gold Medals (Ankan Bhattacharya, Andrew Gu, and James Lin) and 3 Silver Medals (Zachary Chroman, Vincent Huang, and Jungyao Peng).
Zachary is an A-Star student for many years. Ankan and James were members of the 2013 USA Junior Balkan Math Olympiad team which was selected and trained by A-Star Program.
Here is a CBS News about the USA IMO team.