| W | World | 43.18 | Michael Johnson | USA | 7/26/1999 | Seville, ESP |
| U | American | 43.18 | Michael Johnson | Nike | 7/26/1999 | Seville, SPA |
| L | 2014 Winner | 45.91 | Stephon Pamilton | Illinois | ||
| C | Collegiate | 44.00 | Quincy Watts | So. California | 5/6/1992 | Austin, TX |
| B | Conference Meet | 44.87 | Andrew Pierce | Ohio State | 2000 | Iowa City, IA |
| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 1 | Shisler, Alex | JR | Penn State | 47.38 | 47.38 Jim Thorpe Open |
| 2 | Aly, Nicholas | JR | Iowa | 48.38 | 48.38 2015 Jim Duncan Invitational |
| 3 | Sanders, Austin | JR | Michigan St. | 48.45 | 48.45 ACC-Big Ten Challenge |
| 4 | Gipson, Levi | JR | Nebraska | 46.51 | 46.51 2015 Arizona State Pac-12 vs Big 10 Invitational |
| 5 | Bender, Jake | JR | Nebraska | 46.64 | 46.64 2015 Arizona State Pac-12 vs Big 10 Invitational |
| 6 | Van Cleave, Kaleb | SR | Iowa | 47.68 | 47.68 2015 Jim Duncan Invitational |
| 7 | Rolle, Kinard | FR | Purdue | 49.21 | 49.21 Rankin/Poehlein Invitational |
| 8 | Gaibler, Riley | SO | Penn State | DQ | 49.27 Bison Outdoor Classic |
| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 1 | Davis, Ryan | SO | Wisconsin | 47.23 | 47.23 Wisconsin Open |
| 2 | Arvia, Chris | JR | Purdue | 48.10 | 48.10 XIX Alan Connie Shamrock Invitational |
| 3 | Leto, Alex | FR | Maryland | 48.70 | 48.70 Morgan State Legacy Track & Field Meet |
| 4 | Zahn, DJ | SR | Illinois | 45.70 | 45.70 2015 Jim Click Shootout |
| 5 | Roese, Nate | SO | Minnesota | 47.16 | 47.16 Musco Invitational |
| 6 | Frederick, Kendal | JR | Purdue | 47.87 | 47.87 2015 Jim Click Shootout |
| 7 | Jimerson, Jordan | FR | Rutgers | 48.84 | 48.84 2015 Colonial Relays |
| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 1 | Rush, Cody | JR | Nebraska | 47.26 | 47.26 Nebraska Invitational |
| 2 | Parks, Nicholas | SR | Purdue | 48.13 | 48.13 XIX Alan Connie Shamrock Invitational |
| 3 | Thompson, Brendan | SO | Iowa | 48.68 | 48.68 Baldy Castillo Invitational |
| 4 | Bruton, LaMar | SO | Ohio State | 46.45 | 46.45 Virginia Challenge |
| 5 | Griffith, Jermaine | SO | Rutgers | 47.08 | 47.08 2015 UT Challenge |
| 7 | Wilson, Lionel | SR | Maryland | 48.90 | 48.90 Kehoe Twilight Meet |
| 8 | Ellis, Corbin | FR | Wisconsin | DQ | 47.73 LSU Alumni Gold |
| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 1 | Jordan, D'Andre | SR | Rutgers | 47.37 | 47.37 Larry Ellis (College) |
| 3 | Burkert, Marco | FR | Indiana | 48.50 | 48.50 ACC-Big Ten Challenge |
| 4 | Page, Champ | JR | Ohio State | 46.51 | 46.51 Ohio State - Jesse Owens Classic |
| 5 | Morgan, Derrick | SR | Indiana | 46.96 | 46.96 2015 Arizona State Pac-12 vs Big 10 Invitational |
| 6 | Davey, Brennan | SR | Iowa | 47.72 | 47.72 Musco Invitational |
| 7 | Burns, Matt | FR | Illinois | DQ | 48.94 Illinois Twilight |
| 8 | Clark, Antonio | FR | Michigan St. | 48.16 | 48.16 Virginia Challenge |
| W | World | 43.18 | Michael Johnson | USA | 7/26/1999 | Seville, ESP |
| U | American | 43.18 | Michael Johnson | Nike | 7/26/1999 | Seville, SPA |
| L | 2014 Winner | 45.91 | Stephon Pamilton | Illinois | ||
| C | Collegiate | 44.00 | Quincy Watts | So. California | 5/6/1992 | Austin, TX |
| B | Conference Meet | 44.87 | Andrew Pierce | Ohio State | 2000 | Iowa City, IA |
| Lane | Athlete | Yr. | Team | Seed | Note |
|---|---|---|---|---|---|
| 1 | Jordan, D'Andre | SR | Rutgers | 47.07 | 47.37 Larry Ellis (College) |
| 2 | Gipson, Levi | JR | Nebraska | 46.91 | 46.51 2015 Arizona State Pac-12 vs Big 10 Invitational |
| 3 | Page, Champ | JR | Ohio State | 46.88 | 46.51 Ohio State - Jesse Owens Classic |
| 4 | Zahn, DJ | SR | Illinois | 45.50 | 45.70 2015 Jim Click Shootout |
| 5 | Bender, Jake | JR | Nebraska | 46.72 | 46.64 2015 Arizona State Pac-12 vs Big 10 Invitational |
| 6 | Bruton, LaMar | SO | Ohio State | 46.78 | 46.45 Virginia Challenge |
| 7 | Griffith, Jermaine | SO | Rutgers | 46.84 | 47.08 2015 UT Challenge |
| 8 | Morgan, Derrick | SR | Indiana | 46.91 | 46.96 2015 Arizona State Pac-12 vs Big 10 Invitational |