Track and field starts ; women begin quest for 100-meter title . U.S. , Saudi meet again in 100-meter butterfly final . Soccer quarters feature Phelps against Group E. . 4 ) Soccer : Saudi woman takes Maria Sharapova mat .
Track and field starts ; women begin quest for 100-meter title . U.S. , Saudi meet again in 100-meter butterfly final . Soccer quarters feature Phelps against Group E. . Saudi woman takes Maria Sharapova mat .