Relay Finals on the Track Highlight Friday's Action

It's semifinal day for most of the men's team sports and boxing, the spotlight will be on track and field. It will tough to top the amazing night at the track on Thursday, highlighted by perhaps the best 800 meter and 200 meter races ever run as well as American 1-2 finishes in the triple jump and decathlon.

Gold: Track & Field - Women's 4x100 Meter Relay - 3:40p.m. (NBC Prime Time). The American "B" squad put up an astonishing 41.64 in the heats, just 0.04 off the Olympic record set in 1980 by East Germany. Expect Allyson Felix and Carmelita Jeter to take over legs two and four, respectively for the final. If the passes are nearly as good as they were in the heats the 27 year old world record of 41.37 by East Germany could be under threat and the Americans could win this event for the first time since Atlanta in 1996. The Jamaicans will challenge the Americans, but Kerron Stewart and Sherone Simpson are not in best form.

Silver: Track & Field - Men's 4x400 Meter Relay - 4:20p.m. (NBC Prime Time). The U.S. qualified for the final despite leadoff leg Manteo Mitchell running about half the race with a broken leg. He will be replaced by 400 meter hurdler Angelo Taylor in the final. The U.S. looks like they should still win as no other squad can put four strong legs together. Any challenges should come from the Bahamas, Trinidad and Tobago and perhaps Great Britain.

Bronze: Track & Field - Women's 1500 Meters - 3:55p.m. (NBC Prime Time). Current world champion Jenny Simpson of he U.S. failed to qualify for the final, but Morgan Uceny was ranked first in the world last year despite a fall at the world championship final. Asli Cakir of Turkey, who has served a two-year drug suspension, is among the favorites as is Ethiopian Abeba Aregawi. Last year's world championships are not looking to be a good predictor of this year's Olympic final as the first nine finishers from the 2011 worlds did not qualify for the Olympic final. If this race is slow and tactical like the men's race, anything is possible.

Also: The U.S. men's basketball team faces off against 2004 Olympic champions Argentina in the semifinals at 4:00p.m. (NBCSN)

Jordan Burroughs of the U.S. is the current world champion in 74 kilogram freestyle wrestling. He won the worlds in his first year as an international wrestler after winning the NCAA title for Nebraska earlier in the year.  The final is slated for 2:50p.m. (NBC)