All sub 1'45" performances from 2020
| # | Mark | SR | Athlete | IR | Nat | Pos | Venue | Date |
| 1 | 1.43.15 | 1 | Donavan Brazier | | USA | 1 | Monaco | 14-08-2020 |
| 2 | 1.43.23 | 2 | Bryce Hoppel | | USA | 2 | Monaco | 14-08-2020 |
| 3 | 1.43.76 | | Donavan Brazier | 2 | USA | 1 | Stockholm | 23-08-2020 |
| 4 | 1.43.84 | | Donavan Brazier | 3 | USA | 1 | Newberg OR | 31-07-2020 |
| 5 | 1.44.09 | 3 | Daniel Rowden | | GBR | 1 | Zagreb | 15-09-2020 |
| 6 | 1.44.14 | 4 | Marco Arop | | CAN | 3 | Monaco | 14-08-2020 |
| 7 | 1.44.16 | 5 | Ferguson Rotich | | KEN | 1 | Doha | 25-09-2020 |
| 8 | 1.44.18 | 6 | Jake Wightman | | GBR | 1 | Ostrava | 08-09-2020 |
| 9 | 1.44.22i | | Donavan Brazier | 4 | USA | 1 | New York (The Armory) NY | 08-02-2020 |
| 10 | 1.44.34 | | Ferguson Rotich | 2 | KEN | 1 | Marseille | 03-09-2020 |
| 11 | 1.44.47 | 7 | Andreas Kramer | | SWE | 2 | Ostrava | 08-09-2020 |
| 12 | 1.44.51 | 8 | Amel Tuka | | BIH | 3 | Ostrava | 08-09-2020 |
| 13 | 1.44.56 | 9 | Benjamin Robert | | FRA | 4 | Monaco | 14-08-2020 |
| 14 | 1.44.56 | 10 | Elliot Giles | | GBR | 2 | Doha | 25-09-2020 |
| 15 | 1.44.67 | | Marco Arop | 2 | CAN | 2 | Stockholm | 23-08-2020 |
| 16 | 1.44.68 | | Elliot Giles | 2 | GBR | 2 | Marseille | 03-09-2020 |
| 17 | 1.44.74 | | Daniel Rowden | 2 | GBR | 1 | Göteborg | 29-08-2020 |
| 18 | 1.44.75 | 11 | Max Burgin | | GBR | 1 | Stretford | 11-08-2020 |
| 19 | 1.44.75 | | Elliot Giles | 3 | GBR | 2 | Zagreb | 15-09-2020 |
| 20 | 1.44.78 | | Ferguson Rotich | 3 | KEN | 1 | Nairobi | 03-10-2020 |
| 21 | 1.44.81 | 12 | Edose Ibadin | | NGR | 1 | Alexandria VA | 01-08-2020 |
| 22 | 1.44.82 | 13 | Tony van Diepen | | NED | 4 | Ostrava | 08-09-2020 |
| 23 | 1.44.82 | | Ferguson Rotich | 4 | KEN | 1 | Rovereto | 08-09-2020 |
| 24 | 1.44.83 | 14 | Kyle Langford | | GBR | 5 | Monaco | 14-08-2020 |
| 25 | 1.44.85 | | Jake Wightman | 2 | GBR | 3 | Zagreb | 15-09-2020 |
| 26 | 1.44.93 | 15 | Marc Reuther | | GER | 6 | Monaco | 14-08-2020 |
| 27 | 1.44.95 | | Bryce Hoppel | 2 | USA | 4 | Zagreb | 15-09-2020 |
| 28 | 1.44.96 | 16 | Peter Bol | | AUS | 7 | Monaco | 14-08-2020 |