The United States and China continue to battle for the overall medal count lead with the US beginning Day 9 with a narrow 54-53 overall lead. The USA also holds a 26-25 advantage in gold medals.

Gymnastics, tennis and track & field are among the notable events Sunday and the United States will be well-represented. Serena and Venus Williams will go for gold in the women's doubles; it would be their third career doubles gold medal.

The United States has won three gymnastics medals thus far and they will have the chance to add two more on Day 9. Jake Dalton will compete for the U.S. in men's floor exercise while McKayla Maroney will compete in the women's vault.

The most notable event of the day might be the men's 100m dash. Tyson Gay, Justin Gatlin and Ryan Bailey will try to bring home medals for the United States.

For a complete breakdown, visit Sports Illustrated's medal count tracker.

For more on the Olympics, check out SB Nation's London 2012 Olympics Hub.