| Event | Heat | Status | |
|---|---|---|---|
| Men 400 M (Prelims) | 3| | ||
| Friday 3:37 PM | 
| Record | Athlete | Date | ||
|---|---|---|---|---|
| WR | World | Kerron Clement - USA | 44.57 | 3/12/2005 | 
| NR | American | Michael Norman - USC | 44.52 | 3/10/2018 | 
| MR | Meet | Michael Johnson - NIKE | 44.63 | 3/4/1995 | 
| FR | Facility | Fred Kerley - NIKE | 45.18 | 2/17/2018 | 
| Pl | Pos | Athlete | Time | ||||
|---|---|---|---|---|---|---|---|
| 1 | 6 | Kahmari MONTGOMERY NIKE  | 
46.71 Q | 0.170 | 21.06 [21.06]  | 46.71 [25.65]  | |
| 2 | 5 | Brycen SPRATLING New York Athletic Club (NYAC)  | 
46.93 | 0.186 | 21.45 [21.45]  | 46.93 [25.49]  | |
| 3 | 3 | Paris SIMMONS Unattached  | 
48.39 | 0.172 | 23.32 [23.32]  | 48.39 [25.08]  | |
| 4 | 2 | Cole KREHNBRINK Appalachian State University  | 
48.48 PB  | 0.207 | 22.35 [22.35]  | 48.48 [26.14]  | |
| DNF | 4 | Brian FAUST Kentucky  | 
- | 0.228 | 
| Split | Intermediate Leader | Time | Fastest Split | Time | 
|---|---|---|---|---|