Justin Gatlin and Tyson Gay have qualified for London 2012 with sub-9.90 second times at the US trials.
2004 Olympic champion Gatlin clocked 9.80 in the 100m ahead of Gay, who finished in 9.86.
The US team's third sprinter will be Ryan Bailey, whose time of 9.93 was one hundredth of a second ahead of Michael Rodgers.
The first five to finish all dipped under 10 seconds, with Darvis Patton finishing in 9.96.
Men's 100m times
World record - Usain Bolt
Fastest time in 2012 - Usain Bolt
Winning time at US trials - Justin Gatlin
Fifth place at US trial - Darvis Patton
Winning time at UK trials - Dwain Chambers
It will be Gatlin's first Olympics since Athens, having missed the 2008 Beijing games due to a doping ban.
"I have a lot left in the tank. This season so far has been undefeated and I'm just trying to ride that wave," said Gatlin.
Dwain Chambers won the Aviva 2012 UK trials on Saturday, but
his time of 10.25
was seven hundredths of a second outside the 'A' qualification time he required.
The final place in the women's 100m US team will be decided by either a run-off or the toss of a coin after
finished in a dead heat for third place.
With no tie-break procedure included in their regulations, USA Track and Field announced that both athletes will be given the choice of their preferred method. World champion
took the first two places.
Chambers wins the UK trials 100m
recorded the fastest time in the world this year to win the men's 400m. The 2008 Olympic champion, also returning from a doping ban, finished in 44.86 ahead of
, who both recorded personal bests to complete the US trio in the event.
In the women's event,
also recorded a world-best for 2012 so far with a time of 49.28 to finish comfortably ahead of