| W | World | 46.78 | Kevin Young | USA | 7/6/1992 | Barcelona, ESP |
| U | American | 46.78 | Kevin Young | Foot Locker AC | 7/6/1992 | Barcelona, ESP |
| L | 2014 Winner | 49.70 | Miles Ukaoma | Nebraska | ||
| C | Collegiate | 47.56 | Kerron Clement | Florida | 5/11/2005 | Sacramento, CA |
| B | Conference Meet | 48.95 | Jon Thomas | Indiana | 1985 | Evanston, IL |
| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 2 | Joseph, Paul | SO | Maryland | 53.62 | 53.62 Morgan State Legacy Track & Field Meet |
| 3 | Koroknai, Mate | SO | Nebraska | 50.80 | 50.80 Michael Johnson Classic |
| 4 | Kendziera, David | SO | Illinois | 50.66 | 50.66 2015 Jim Click Shootout |
| 5 | Wiseman, Drew | SO | Nebraska | 52.11 | 52.11 Michael Johnson Classic |
| 6 | Thompson, Aaron | SR | Wisconsin | 51.99 | 51.99 Wisconsin Open |
| 7 | Maliff, Terrence | SR | Maryland | 53.24 | 53.24 Morgan State Legacy Track & Field Meet |
| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 3 | Pille, Sean | JR | Nebraska | 51.21 | 51.21 Michael Johnson Classic |
| 4 | Viney, Cam | JR | Illinois | 49.92 | 49.92 2015 Jim Click Shootout |
| 5 | Holder, Kyle | JR | Rutgers | 52.75 | 52.75 Princeton Quad Meet |
| 6 | Wolff, Mitch | SO | Iowa | 51.26 | 51.26 Musco Invitational |
| 7 | Manley, Diquis | SO | Indiana | 52.83 | 52.83 2015 Billy Hayes Invitational |
| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 2 | Anderson, Davon | FR | Ohio State | 53.88 | 53.88 Virginia Challenge |
| 3 | Ikpefan, Obokhare | SO | Purdue | 50.81 | 50.81 2015 Jim Click Shootout |
| 4 | Blanks, Antonio | JR | Ohio State | 50.42 | 50.42 Virginia Challenge |
| 5 | Fountain, Rashawn | SO | Minnesota | 52.64 | 52.64 Musco Invitational |
| 6 | Mallett, Aaron | SO | Iowa | DNF | 51.41 Musco Invitational |
| 7 | Hilderbrand, Mark | SR | Nebraska | 52.88 | 52.88 Nebraska Invitational |
| W | World | 46.78 | Kevin Young | USA | 7/6/1992 | Barcelona, ESP |
| U | American | 46.78 | Kevin Young | Foot Locker AC | 7/6/1992 | Barcelona, ESP |
| L | 2014 Winner | 49.70 | Miles Ukaoma | Nebraska | ||
| C | Collegiate | 47.56 | Kerron Clement | Florida | 5/11/2005 | Sacramento, CA |
| B | Conference Meet | 48.95 | Jon Thomas | Indiana | 1985 | Evanston, IL |
| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 1 | Pille, Sean | JR | Nebraska | 52.17 | 51.21 Michael Johnson Classic |
| 2 | Thompson, Aaron | SR | Wisconsin | 51.84 | 51.99 Wisconsin Open |
| 3 | Wiseman, Drew | SO | Nebraska | 51.50 | 52.11 Michael Johnson Classic |
| 4 | Kendziera, David | SO | Illinois | 50.63 | 50.66 2015 Jim Click Shootout |
| 5 | Viney, Cam | JR | Illinois | 50.91 | 49.92 2015 Jim Click Shootout |
| 6 | Blanks, Antonio | JR | Ohio State | 51.26 | 50.42 Virginia Challenge |
| 7 | Ikpefan, Obokhare | SO | Purdue | DNS | 50.81 2015 Jim Click Shootout |
| 8 | Wolff, Mitch | SO | Iowa | 51.89 | 51.26 Musco Invitational |