Two Jamaicans , three Americans lead field in women 's 200 final . Female boxers square off in first-ever semifinals . Decathlon begins with five events , including 100 meters . - The first U.S. Olympic team to compete at the Olympics since 1904 is announced by President Theodore Roosevelt and his wife Eleanor Roosevelt.
Two Jamaicans , three Americans lead field in women 's 200 final . Female boxers square off in first-ever semifinals . Decathlon begins with five events , including 100 meters . Team USA meets Australia in men 's basketball quarterfinals .