This race has so many possible superlatives, I'm not sure where to start. 

Salwa Eid Naser, 21, just ran the fastest 400m since Marita Koch's world record (47.60) was set in 1985, burying 2019 global leader and 2016 Olympic champion Shaunae Miller-Uibo en route to claiming the world title for Bahrain. 

Naser's winning time? 48.14—nearly a full second better than the PR she entered the meet with, 49.08, and the third-fastest time in world history. It was the 2019 Diamond League champion's fifth 400m race this week—she also raced two rounds of the mixed 4x400m relay, in which she delivered a 49.70 split during the final.

Miller-Uibo, 25, who finished runner-up in a 48.37 PR—the sixth-fastest time ever—immediately sat down on the track after crossing the line, looking absolutely stunned and searching for answers after missing out on gold at her second world championships in a row. 

The Nigerian-born Naser also beat Miller-Uibo in London in 2017, taking silver behind the United States' Phyllis Francis.

SALWA EID NASER SHOCKS THE WORLD?

pic.twitter.com/usunJsc3SS

— FloTrack (@FloTrack) October 3, 2019

Here's the updated world top 10 list following that insane final:

American fourth-placer, South Carolina's Wadeline Jonathas, added some more accolades to her unique, wide-ranging resume as a top world finisher, all-dates collegiate record-breaker, and the No. 9 performer in American history, as she's also won NCAA titles in Division I and III. 

Francis, the defending 2017 world champion, finished fifth in 49.61—a PR.

The top five finishers all ran PRs in the third-fastest world championships final in history.