Take a look at the incoming Class of 2018 -- last year's best juniors -- to see their year-over-year progression from 2016 to 2017. Better yet, the top 1,000 athletes in each event have one more year to make another leap on the track.
100m l 200m l 400m l 100mH l 300mH
Note: List uses performances in the MileSplit database. To be included, athletes must have both 2016 and 2017 performances in the database. No hand-times were used; only F.A.T. Under 'difference', regression is indicated in parentheses and progression is indicated without parentheses