Since someone is posting on the USATF official facebook page asking for someone to come onto this thread and explain about seeding in the 1500, I repeat this: It is rule 166 1.d.ii.b
USATF is following their rules which have been in place for at least the past four years. The rule states for events up to 400 seeding in heats after the first is based on place. For longer events seeding is based on best performance in the calendar year including times run in the prelims. Remember Wheating didn't even meet the qualifying time but was accepted to fill the field.
Betsy Reed OF the USAT&F Officials group refines Starters post and in doing so clears up the idea that in the semis seeding took into account races from before the trials.
Her post> The short answer is the variance in the first round results; Heat 1 advanced 9 of 10 competitors to the semis, Heat 3 all 10, but only the 6 automatic qualifies advanced from Heat 2.
Assignments to the semis were made by ranking the automatic qualifiers in an order of: fastest first place (Engles, 3:41.92); second best first place (Avila, 3:42.27); slowest first place (Blankenship, 3:49.61); fastest second place (Winn, 3:42.22); second best second place (Manzano, 3:42.28); slowest third place (3:50.01); etc.all the way to the slowest sixth place time; then ranking the six time qualifiers in order. After ranking all qualifiers (by place over time), the assignments came from the serpentine pattern (Semi 1, Semi 2, Semi 2, Semi 1, Semi 1, etc).
(See Rule 166, "Regulations for Forming Heats" for more details on the rules that govern the process.)https://www.facebook.com/groups/98592597792/permalink/10153602006377793/?comment_id=10153605736087793¬if_t=group_comment¬if_id=1468166200567215