| W | World Outdoor 2021 | 43.03 | Wayde van Niekerk | RSA | 8/14/2016 | Rio de Janeiro, BRA |
| A | American Outdoor 2021 | 43.18 | Michael Johnson | Nike | 8/26/1999 | Seville, ESP |
| C | College Outdoor 2021 | 43.61 | Michael Norman | So. California | 6/8/2018 | Eugene, OR |
| U | C-USA championship | 44.53 | Emmanuel Korir | UTEP | 5/14/2017 |
| Lane | # | Athlete | Yr. | Team | Seed |
|---|---|---|---|---|---|
| 1 | 606 | JONES, DARIEN | FR | 47.67 | |
| 2 | 149 | ROBBINS, TY JAYE | SR | CHARLOTTE |
47.60 |
| 3 | 340 | POWELL, JEVAUGHN | FR | UTEP |
46.76 |
| 4 | 579 | MOSLEY, MARLOWE | JR | W. KENTUCKY |
46.74 |
| 5 | 938 | JOHNSON, TREY | SO | SO. MISS. |
46.42 |
| 6 | 321 | BAILEY, SEAN | SR | UTEP |
46.52 |
| 7 | 618 | TORIAN, JAQUEZ | JR | 47.04 | |
| 8 | 156 | WARE, BRAXTON | FR | CHARLOTTE |
47.40 |
| Lane | # | Athlete | Yr. | Team | Seed |
|---|---|---|---|---|---|
| 3 | 606 | JONES, DARIEN | FR | 48.78 | |
| 4 | 330 | HILL, JOSHUA | FR | UTEP |
47.55 |
| 5 | 268 | BOULLION, SETH | SO | LA TECH |
48.02 |
| 6 | 669 | REEVEY, ZIPHION | JR | NORTH TX |
50.18 |
| 7 | 618 | TORIAN, JAQUEZ | JR | 46.98 |
| Lane | # | Athlete | Yr. | Team | Seed |
|---|---|---|---|---|---|
| 3 | 579 | MOSLEY, MARLOWE | JR | W. KENTUCKY |
47.50 |
| 4 | 384 | HERITAGE, DYLAN | SO | UTSA |
50.63 |
| 5 | 340 | POWELL, JEVAUGHN | FR | UTEP |
47.50 |
| 6 | 611 | NICKSON, PIERRE | SO | 48.65 | |
| 7 | 941 | MARSHALL, ASHER | FR | SO. MISS. |
50.44 |
| 8 | 615 | STEWART, MATTHEW | JR | 48.63 |
| Lane | # | Athlete | Yr. | Team | Seed |
|---|---|---|---|---|---|
| 3 | 933 | BUTLER, DONALD | FR | SO. MISS. |
47.68 |
| 4 | 391 | MASTERS, LOGAN | FR | UTSA |
49.13 |
| 5 | 156 | WARE, BRAXTON | FR | CHARLOTTE |
47.64 |
| 6 | 321 | BAILEY, SEAN | SR | UTEP |
45.46 |
| 7 | 737 | MARSHMAN, EVAN | SO | RICE |
49.29 |
| Lane | # | Athlete | Yr. | Team | Seed |
|---|---|---|---|---|---|
| 3 | 329 | HEWITT, KEVIN | FR | UTEP |
47.71 |
| 4 | 938 | JOHNSON, TREY | SO | SO. MISS. |
46.10 |
| 5 | 398 | RHODES, NOAH | FR | UTSA |
49.82 |
| 6 | 149 | ROBBINS, TY JAYE | SR | CHARLOTTE |
47.55 |
| 7 | 640 | BOYCE, CLAYTON | FR | NORTH TX |
49.04 |