The 2012 Summer Olympics is barreling toward its conclusion, but the surprises haven't stopped. Day 12 of competition saw more than one outstanding performance from someone spectators weren't expecting.
Let's take a look at the Olympic medal count as it currently stands.
*Full medal standings courtesy of nbcolympics.com
These medal standings will change throughout Thursday's competition. China and the United States are untouchable at this point, but the rest of the field will continue jockeying for position.
Aiding their overall performance will be more surprising contributors.
Let's check out which athletes already (unexpectedly) helped their country on Day 12.
Chun's bronze medal in the 48 kg/105.5 lbs. division of women's freestyle wrestling is shocking because of Team USA's lack of success on the wrestling mat so far in London.
Chun's bronze is the Americans' first wrestling medal in London.
A victory over Iwona Nina Matkowska earned Chun a berth in the bronze medal match versus Irina Melvik-Merlini. She dominated Matkowska 5-0 to get there, and she defeated Melvik-Merlini 3-0 to earn the coveted medal.
Success in other international events doesn't necessarily qualify Chun for an Olympic medal, but she proved her value on Wednesday. Her victory added to Team USA's overall total and earned her country accolades in uncharted territory.
Argentina Men's Basketball
Maybe it's just me, but Argentina's team hasn't impressed me nearly as much as expected. Manu Ginobili, Carlos Delfino and Luis Scola are all very talented players, but this team just doesn't seem to mesh.
Against Brazil in their quarterfinal clash, I expected them to falter. Brazil's frontcourt is hard-nosed, and Scola is a talented but less physical inside player.
The Argentinian squad scored a huge victory in the end. They defeated Brazil 82-77 and earned a berth in the semifinals against Russia. Scola supplied 17 points, while Ginobili and Delfino combined for 32 points.
This matchup could have gone either way, but Team USA's beating of Argentina earlier in the week suggested a different outcome than what we saw Wednesday.
This was a great game, but the result was surprising. It doesn't directly impact Argentina's medal count just yet, but it puts them one step closer to a bronze medal berth.
Argentina hasn't had many chances to medal thus far, so this is just as valuable for them.
Antyukh's victory over Lashinda Demus in the women's 400-meter hurdles is shocking to say the least. Antyukh has never won this event at the Olympics or World Championships.
Demus has. She took gold in this event at the 2011 World Championships, and set the American record of 52.47 that same year. She's arguably the world's greatest runner at this distance, and her silver medal is a disappointment.
A personal best of 52.70 propelled Antyukh to new heights as she squeaked by Demus. Seven hundredths of a second is a big difference on the track, but it was close throughout the race.
The 400m hurdles is an excruciating event. If you've ever run a regular 400, I'm sure you can understand that.
Antyukh's medal helped Russia add to their third-place total and took her career, at 31 years old, to new heights.
Be sure to check out Bleacher Report's Olympic medal tracker for the latest happenings in London.