List leader Kendall Baisden, from the USA, at 50.46 is the leading entrant in the long sprint, with six of the top ten junior times in 2014 and a third-place finish at the NCAA Championships, which was also held at Hayward Field, to the credit of the University of Texas student.
Baisden already has a World Junior Championships gold medal in her collection, having been part of the winning 4x400m team in Barcelona two years ago.
The second runner on this year’s list, Shamier Little, is entered in the 400m hurdles instead, so Shakima Wimbley second on the line for the USA and third on the 2014 list at 51.68.
There is then a big gap to Cuba’s Gilda Casanova at 52.28.
Fifth on this year’s list is an Ethiopian, rare in the sprints; Genet Lira’s 52.40 was run at altitude in Gaborone but makes her the fourth-fastest entrant and there will be inevitable interest in her progress, especially as no Ethiopian junior has won a medal at these Championships at a distance below 800m.
Parker Morse for the IAAF