The United States and China are still very much ahead of the pack in the medal count for the 2012 Summer Olympics in London. The two countries have been jockeying atop the standings since the games began, and they remain competitive so far Wednesday. The U.S. has added three medals to its total (one gold, two bronze) the Chinese have added four (two gold, two silver).

The highlight of the day so far for the Americans has been Kristin Armstrong, who won her second consecutive Olympic gold medal in the women's cycling individual time trial with a dominant showing. Team USA also added a bronze in the women's rowing quadruple sculls.

The United States took bronze in the men's diving 3-meter springboard. The Chinese took gold in the event, however, continuing their dominance in the sport. China took silver in the women's 25-meter pistol, and earned another gold and silver in an all-China final in women's singles table tennis.

There are plenty more medal opportunities coming up for the Americans. Mariel Zagunis is going for her third straight Olympic gold in the women's fencing individual sabre, and Danell Lleyva and John Orozco should vie for medals in the men's gymnastics individual all-around competition.

Here is a look at the top five countries in the medal count after four days of action:

1. China, 27 (15 gold, 8 silver, 4 bronze)
2. United States, 26 (10, 8, 8)
3. Japan, 14 (1, 4, 9)
4. France, 12 (5, 3, 4)
5. Germany, 12 (3, 7, 2)

For complete coverage of the 2012 London Olympics, visit SB Nation's Summer Olympics hub.