ago.22.2008
The US trio of LaShawn Merritt, Jeremy Wariner and David Neville took a clean sweep in the Men's 400m, and will be a force to be reckoned with.
The Bahamas, who won the silver medal at the 2007 World Championships in 2:59.18, should again be prominent.
Poland finished third at the 2007 World Championships with 3:00.05 and also have the potential to be among the medals winners.
T&T in 4 x 400 battle
The United States have dominated the Men's 4 x 400m Relay in the Olympic Games, winning 15 out of a possible 21 Olympic titles.
Trinidad and Tobago are drawn in lane two in the second heat.Their season best time of 3.04.2 is the 5th best in a heat that includes Bahamas,Jamaica and Great Britain.
The first three finishers in both heats and the two fastest losers will advance to Saturday's final.