The United States added six more medals to its 2012 Summer Olympics tally on Sunday from London, but were still edged by Team China for the overall medal lead through nine days of competition.

The Americans picked up two golds on day nine, as women's doubles sisters Venus and Serena Williams cruised to their third career gold as a tandem, while Team USA member Sanya Richards-Ross narrowly edged the field for a win in the women's 400m event.

With 161 of the 302 Olympic events now concluded, China and the U.S. remain in a neck-and-neck battle with only Great Britain hanging around as a viable contender to make a run. Hopefully for the United States, day 10 of this year's events will provide more than enough of an opportunity to regain their overall lead.

Here are the current medal leaders:

1. China, 61 (30 gold, 17 silver, 14 bronze)

2. United States, 60 (28, 14, 18)

3. Great Britain, 37 (16, 11, 10)

4. Russia, 35 (4, 16, 15)

5. Japan, 27 (2, 12, 13)

Be sure to stay with this StoryStream for more coverage of local athletes at this year's Summer Games. Also head over to SB Nation's Olympic hub for more coverage from London.