The first full day of competition at the 2016 Rio Olympics was a good one for the U.S. -- the Americans won five medals total, tying Japan and China for the most so far.
Hungary and Australia were the only countries to win two gold medals on the opening day.
Day 2 U.S. medals
• Katie Ledecky, Women's 400m freestyle (swimming) *World Record
• Men's 4x100m freestyle relay (swimming)
• Alexander Massialas, Men's individual foil (fencing)
• Corey Cogdell, Women's Trap
• Dana Vollmer, Women's 100m butterfly (swimming)
• Cody Miller, Men's 100m breaststroke (swimming)
• Leah Smith, Women's 400m freestyle (swimming)
Phelps does it again: Michael Phelps swam an impressive second leg to give the U.S. a lead they would never relinquish in the 4x100m freestyle relay. Nathan Adrian closed it out for the gold.
Ledecky lives up to the hype: The 19-year-old phenom absolutely destroyed her own world record in the 400m freestyle to take the gold. She won by nearly five seconds.
Women's gymnastics dominates: Looking nearly unstoppable, the U.S. women's gymnastics team nearly swept the qualifying events. Simone Biles and Aly Raisman qualified for the individual all-around competition.
Vollmer takes bronze: Dana Vollmer was no match for Sweden's Sarah Sjostrom, who set the world record, but she took third place in the 100m butterfly.