Day 7 of the Olympics marks the beginning of the track and field events, and current Wimbledon champion Serena Williams taking on Victoria Azarenka, in the women's tennis singles semifinals. Michael Phelps' total medal count can continue to rise as he goes back in the pool to compete in the 100m butterfly finals.

Women's soccer goes in with an intense match with Brazil facing World Champion Japan in the quarterfinals. To close out a full week of Olympic greatness, here's the 5 Best Olympic Events to Watch Today.