Hosts Brazil kicks off World Cup 2014 against Croatia . Jennifer Lopez sings at opening ceremony . NEW : The U.S. women's soccer team wins gold in London Olympics. Spain is defending champion from 2010 in South Africa .
Hosts Brazil kicks off World Cup 2014 against Croatia . Jennifer Lopez sings at opening ceremony . NEW : Police fire teargas at protesters in Sao Paulo . Spain is defending champion from 2010 in South Africa .