•Dana Vollmer had a triumphant return to the Olympics, setting a world record to win the 100 butterfly in 55.98 seconds. Vollmer made the Olympics as a 16-year-old in 2004 but didn't qualify for Beijing in 2008. •Michael Phelps moved closer to becoming the most decorated Olympian in history. An American silver in the 400-meter freestyle relay gave Phelps 17 medals for his career •14 golds, a silver and two bronzes.