However, he says he plans on also running the 1500 even if he makes the team in the 800.
Millington was a ways off the 28:00 standard when he won the Night of the 10,000m PBs last month, but set a huge 33-second PB to get it.
A rabbit will pace the race at the OT standard of 4:09.50.
Gregson won the race in 3:35.78.
Trujillo won the Eugene Marathon in 2:18:54 to get the 2:19 mark by only 6-seconds. He'll represent Guatemala in Rio.
You had to be 2:28 faster than the standard to qualify for Boston this year. So if you were 2:29, there may be a spot on the line for you.