So I just read an article about this young lady where it states she "had never run summer track. Never run the 400 seriously, except in relays, until May."
She just completed her freshman year at Illinois. She ran 50.95 to win the NCAA and then won World Juniors in 50.50.
Her 50.50 puts her number 5 on the World Junior List. She is number 2 on the US Junior list behind only SRR.
She was a hurdler in high school with bests of 14.28 and 42.11. The only 400 time I found for her was 57.5 from 2011.
Wow. She is coached by Tonja Buford Bailey. Definitely a shocking break through season.