It's a big day in track & field at the 2012 Olympics as four gold medals will be awarded on Wednesday afternoon.

All of the medal events will air on tape delay on NBC in primetime. You can watch a free live stream of each event by clicking here.

The women's long jump, 400-meter hurdles, 200-meter race and the men's 110-meter hurdles finals are all set to take place in London.

At 3:05 p.m. ET, the women's long jump will get underway. Brittney Reese of the USA is a heavy favorite heading into the competition. Her personal best of 7.23 meters is the best of the 12 contestants.

Forty minutes later, the women's 400m hurdles final begins. Russia's Natalya Antyukh and Lashinda Demus from the U.S. are the two biggest threats to take home the gold.

The last women's gold medal of the day will be handed out at 4 p.m. ET in the 200m final. Of the eight participants, three are Americans.

One in particular, Allyson Felix, is the overwhelming favorite to come in first place. The 26-year-old won the silver at the event in 2008. He personal best of 21.69 seconds is the third-fastest in U.S. history.

The final medal event for track and field starts at 4:15 p.m. ET with the men's 110m hurdles. This time, two Americans lead the group.

Aries Merritt is the heavy favorite to win the race. He won the world championship this year in the 60m hurdles and ran the fastest time in 2012 at 12.93. Fellow American, Jason Richardson, has the best chance to upset him.