High jump world champion Jesse Williams qualified for London 2012 despite coming fourth at the US Olympic trials.
Only the top three are meant to qualify for the Games but third-placed Nick Ross did not have the "A" qualifying standard, meaning he missed out.
Williams, 28, missed three times at 2.31 metres after clearing 2.28 on his third attempt on a wet day in Eugene.
The American said: "The whole goal was to make London and now I am there I want to get on that podium."
He added: "These conditions were tough. It was really difficult for me to get in a groove and jump to my capabilities."
British high jumper Robbie Grabarz has high hopes of gold at London 2012, having recorded 2.33m at May's Diamond League meeting in Rome.
Jamie Nieto won the competition, Erik Kynard finished second and Ross was third, all at 2.28. Ross said: "It's bittersweet I didn't make the team. I'll definitely be on that podium again."
Five-time national champion Nick Symmonds dominated the men's 800m, winning in 1:43.92 seconds, while Alysia Montano claimed the women's race in 1:59.08.
Former world champion Bernard Lagat easily qualified in the men's 5,000m with a time of 13:42.83.