W2W4 on Saturday in Rio: Hope and Venus in action

— -- Saturday is the first full day of competition at the Rio Olympics, and the first 12 gold medals will be awarded. Here are some of the highlights:

Heats begin at noon ET: Four swimming finals will be awarded. And the United States' Katie Ledecky's first swim of these Games is expected to be in the prelims of the 4x100m freestyle relay. She would win a medal if the U.S. finishes in the top three Saturday night.

4 p.m. ET: The top-ranked U.S. women's team faces third-ranked France in the second game of the group stage. The winner will likely advance to the quarterfinals, but winning the group will provide an easier knockout path. Assuming she plays, Hope Solo will the first keeper in soccer history -- female or male -- to play 200 international games.

6 p.m. ET: The U.S. men's team opens against China. The U.S. has won the last two gold medals and is on a 68-game win streak since the 2006 World Championships. Carmelo Anthony will tie a team record by playing in his 24th Olympic game, and he needs 18 points to pass Michael Jordan for third on the team's Olympic scoring list.

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