| W | World | 46.78 | Kevin Young | 8/6/1992 | Barcelona, ESP | |
| A | American | 46.78 | Kevin Young | Foot Locker AC | 8/6/1992 | Barcelona, ESP |
| C | College Outdoor | 47.56 | Kerron Clement | Florida | 6/11/2005 | Sacramento, CA |
| OV | OVC championship | 50.14 | Russell Holloway | M.T.S.U. | 1977 |
| Lane | # | Athlete | Yr. | Team | Seed |
|---|---|---|---|---|---|
| 1 | 47 | CEDRIC JOHNSON | SO | E. ILLINOIS | 56.23 |
| 2 | 490 | ISAAC LEE | SR | E. KENTUCKY | 55.42 |
| 3 | 382 | ALEX MILLER | SO | BELMONT | 55.27 |
| 4 | 134 | ISAIAH OLIGE | SR | TN ST. | 53.05 |
| 5 | 383 | CALEB CORPREW | SR | BELMONT | 54.35 |
| 6 | 355 | CHRISTIAN CRENSHAW | SR | BELMONT | 55.35 |
| 7 | 150 | DESMOND TANNER | JR | TN ST. | 55.99 |
| 8 | 348 | KHRISTIAN VICKERS | FR | BELMONT | 56.96 |
| Lane | # | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|---|
| 2 | 382 | ALEX MILLER | SO | BELMONT | 54.41 | 54.41 Georgia Tech Invitational |
| 3 | 348 | KHRISTIAN VICKERS | FR | BELMONT | 57.70 | 57.70 Tennessee Challenge |
| 4 | 383 | CALEB CORPREW | SR | BELMONT | 51.90 | 51.90 Tennessee Challenge |
| 5 | 490 | ISAAC LEE | SR | E. KENTUCKY | 54.03 | 54.03 2018 Kentucky Relays |
| 6 | 47 | CEDRIC JOHNSON | SO | E. ILLINOIS | 56.66 | 56.66 2018 Lenny Lyles-Clark Wood Invitational |
| Lane | # | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|---|
| 2 | 151 | CHRISTIAN WILLIAMS | FR | TN ST. | 58.65 | 58.65 Memphis Tiger Invitational |
| 3 | 134 | ISAIAH OLIGE | SR | TN ST. | 52.16 | 52.16 Georgia Tech Invitational |
| 4 | 150 | DESMOND TANNER | JR | TN ST. | 56.35 | 56.35 Alan Connie Shamrock Invitational |
| 5 | 355 | CHRISTIAN CRENSHAW | SR | BELMONT | 52.70 | 52.70 Georgia Tech Invitational |
| 6 | 466 | BEN THOMS | FR | E. KENTUCKY | 56.38 | 56.38 Centre College Track & Field Twilight |