RIO DE JANEIRO, BRAZIL - AUGUST 07: Katie Ledecky of the USA competes in the Women's 400m Freestyle Heats on Day 2 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 7, 2016 in Rio de Janerio, Brazil. (Photo by Vaughn Ridley/Getty Images)Vaughn Ridley/Getty Images

Olympic Swimming 2016: Live Results and Highlights from Sunday's Day 2

Carol SchramAug 7, 2016

The United States picked up two gold medals at the Olympic Aquatics Center during Day 2 of swimming action at the 2016 Summer Olympics.

Katie Ledecky delivered as promised in the women's 400-meter freestyle event, beating her own world record, and then Michael Phelps and Nathan Adrian led the U.S. team to gold in a hard-fought men's 4x100-meter freestyle relay.

The other gold medalists on Sunday were Sarah Sjostrom of Sweden in the women's 100-meter butterfly and Adam Peaty of Great Britain, who also set a world record in the men's 100-meter breaststroke.