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Can you imagine shaving over 15-seconds off of your 400m time? For Christian Santana - that is the incredible reality of his season. He has run inside the 55's on a number of occasions - scoring points for his team on numerous occasions. Previously, he had never broken 70-seconds over the 400m distance.
Right behind him, Owen Smith has shaved 13.7 seconds to run a quick 52.52.
In total - 67 boys have shaved four or more seconds according to this list.
The first sub 50-runner on this list is Christopher Brittingham, who has run 49.6. He ranks 38th on this list - and has accrued over four seconds of improvement.
THE TOP 400 MOST IMPROVED BOYS 400m YOY
Rank | Athlete | 2023 | 2022 | Difference |
| 1 | Christian Santana - Bethlehem Catholic | 55.04 | 1:10.64 | -15.6 |
| 2 | Owen Smith - Upper Dublin | 52.52 | 1:06.22 | -13.7 |
| 3 | Kristian Rogers - Academy Park | 54.91 | 1:07.67 | -12.76 |
| 4 | Dean Bullock - Central Bucks South | 51.09 | 1:00.81 | -9.72 |
| 5 | Donta Hayes - Penn Wood | 53.32 | 1:02.28 | -8.96 |
| 6 | Carter Bentsen - McDowell | 55.31 | 1:03.24 | -7.93 |