Following 4 gals dominate the US top-10 U20 3k performances list (from T&F News):
8:57.27 Ceci (Hopp) St. Geme (Stanford) 7/27/1982
8:58.48 Mary Cain (NikeOP) 7/24/2014
8:58.88i Elise Cranny (Stanford) 3/14/2015
9:00.16i Alexa Efraimson (Washington HS) 1/31/2014
Women's 3k was the longest track distance back in Ceci's day . . . now has been usurped by the 10k, 5k & Steeple . . . outdoors, no 3k races of any quality outside of national U20 champs, regional champs like PanAms, and World U18 & U20 champs.
Kate Murphy will have another opportunity to run World U20 Champs in 2018 but likely will choose the 1500 . . . she opted out of the 1500 this year due to Efraimson & Aragon, which was a wise choice
If Rainsberger is going to run sub-9 and try to best Ceci, it will have to be indoors . . . best opportunity would be NCAA Indoor champs . . . . Cranny goi pulled along to her US U20 indoor record last year by Dom Scott at NCAAs . . . maybe Cranny & Rainsberger & AllieO all line-up together in the 3k next March.