Michael Phelps wins the 100-meter butterfly by 0.23 seconds for his third gold of Games . Including wins by Missy Franklin and Katie Ledecky , the U.S. tops China for overall golds . The Americans have 43 medals total , compared with 42 for the Chinese . The United States won its first ever Olympic swimming medal in a time of 1 minute 58.00 seconds, beating China's world record set earlier this year at 1:57.07. Britain 's Andy Murray will face Roger Federer in men 's tennis final at the All-England Club .
Michael Phelps wins the 100-meter butterfly by 0.23 seconds for his third gold of Games . Including wins by Missy Franklin and Katie Ledecky , the U.S. tops China for overall golds . The United States won its first ever Olympic swimming medal in a time of 1 minute 58.00 seconds, beating China's world record set earlier this year at 1:57.07. Britain 's Andy Murray will face Roger Federer in men 's tennis final at the All-England Club .