| W | World | 43.03 | Wayde van Niekirk | 8/14/2016 | Rio de Janerio, BRA | |
| A | American | 43.18 | Michael Johnson | Nike | 8/26/1999 | Seville, ESP |
| C | College Outdoor | 43.70 | Fred Kerley | Texas A&M | 5/26/2017 | Austin, TX |
| OV | OVC championship | 45.64 | Terrance Branch | SEMO | 1994 |
| Lane | # | Athlete | Yr. | Team | Seed |
|---|---|---|---|---|---|
| 1 | 381 | RYAN TEAGUE | SO | BELMONT | 49.14 |
| 2 | 162 | JAMARIO SCOTT | SO | TN ST. | 48.40 |
| 3 | 138 | CHRISTOPHER GIVENS | FR | TN ST. | 48.80 |
| 4 | 136 | JAMES FAISON | SR | TN ST. | 47.88 |
| 5 | 386 | NATHAN NAMMOUR | JR | BELMONT | 47.96 |
| 6 | 456 | JOHN FERRARO | JR | E. KENTUCKY | 48.16 |
| 7 | 277 | COLLIN SCHWAB | FR | SE MO | 48.95 |
| 8 | 337 | KAYLON JENKINS | FR | SE MO | 49.26 |
| Lane | # | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|---|
| 2 | 354 | ANDREW GARCIA | JR | BELMONT | 50.49 | 50.49 Vanderbilt Black and Gold |
| 3 | 222 | KEWAN SLATON | SO | TN-MARTIN | 49.51 | 49.51 Memphis Tiger Invitational |
| 4 | 138 | CHRISTOPHER GIVENS | FR | TN ST. | 48.88 | 48.88 Georgia Tech Invitational |
| 5 | 337 | KAYLON JENKINS | FR | SE MO | 49.56 | 49.56 Joe Walker Invite |
| 6 | 277 | COLLIN SCHWAB | FR | SE MO | 48.23 | 48.23 Joe Walker Invite |
| 7 | 56 | MICHAEL BROWN | SR | E. ILLINOIS | 51.45 | 51.45 2018 WKU Hilltopper Relays |
| Lane | # | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|---|
| 3 | 326 | BRANDON CHUNN | JR | SE MO | 49.29 | 49.29 Mississippi State Bulldog Relays |
| 4 | 182 | COLLIN BROWN | FR | SIU-E'VILLE | 50.03 | 50.03 Memphis Tiger Invitational |
| 5 | 162 | JAMARIO SCOTT | SO | TN ST. | 49.38 | 49.38 Memphis Tiger Invitational |
| 6 | 131 | JONTUE MCDOWELL | SR | TN ST. | 50.04 | 50.04 Alan Connie Shamrock Invitational |
| 7 | 247 | DARIN DONNELL | FR | TN-MARTIN | 51.82 | 51.82 Memphis Tiger Invitational |
| 8 | 136 | JAMES FAISON | SR | TN ST. | 47.55 | 47.55 Georgia Tech Invitational |
| Lane | # | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|---|
| 2 | 386 | NATHAN NAMMOUR | JR | BELMONT | 47.57 | 47.57 Tennessee Challenge |
| 3 | 456 | JOHN FERRARO | JR | E. KENTUCKY | 49.44 | 49.44 Oliver Nikoloff Invitational |
| 4 | 309 | BRYCE PEASE | FR | SE MO | 49.75 | 49.75 Georgia Tech Invitational |
| 5 | 362 | KADEN KIEFFER | SO | BELMONT | 50.25 | 50.25 Vanderbilt Black and Gold |
| 6 | 381 | RYAN TEAGUE | SO | BELMONT | 49.11 | 49.11 APSU Invitational |
| 7 | 92 | MICHAEL MILLER | JR | E. ILLINOIS | 51.59 | 51.59 2018 Lenny Lyles-Clark Wood Invitational |