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The first day of a "groups" day at the NFL combine generally will consist of weight, height, and other various measurements. With defensive backs it all depends on what you're looking for. For the Jaguars it sounds like they're looking for bigger physical corners with long wingspans.
Below are the results for the 2013 defensive backs at the NFL combine:
Related: NFL Combine | Combine Measurements
| Player | School | Height | Weight | Arm |
| Johnny Adams | Michigan State | 5-10 | 185 | 31.28 |
| Robert Alford | SE Louisiana | 5-10 | 188 | 32.08 |
| David Amerson | N.C. State | 6-1 | 205 | 32.58 |
| Marc Anthony | California | 5-11 | 196 | 32.18 |
| Johnthan Banks | Mississippi State | 6-2 | 185 | 33.78 |
| John Boyett | Oregon | 5-10 | 204 | 30.48 |
| Adrian Bushell | Louisville | 5-9 | 186 | 32.08 |
| Sanders Commings | Georgia | 6-0 | 216 | 32.08 |
| Johnathan Cyprien | Florida Int. | 6-0 | 217 | 31.68 |
| Will Davis | Utah State | 5-11 | 186 | 31.48 |
| Mike Edwards | Hawaii | 5-9 | 189 | 31.58 |
| Matt Elam | Florida | 5-10 | 208 | 32.58 |
| Josh Evans | Florida | 6-1 | 207 | 31.78 |
| Dwayne Gratz | Connecticut | 5-11 | 201 | 32.18 |
| Terry Hawthorne | Illinois | 6-0 | 195 | 31.28 |
| D.J. Hayden | Houston | 5-11 | 191 | 31.18 |
| Aaron Hester | UCLA | 6-2 | 198 | 32.48 |
| Micah Hyde | Iowa | 6-0 | 197 | 31.48 |
| Tony Jefferson | Oklahoma | 5-11 | 213 | 31.58 |
| Josh Johnson | Purdue | 5-9 | 199 | 30.38 |
| Keelan Johnson | Arizona State | 6-0 | 209 | 32.48 |
| Robert Lester | Alabama | 6-1 | 220 | 32.08 |
| Tyrann Mathieu | LSU | 5-9 | 186 | 31.18 |
| Demetrius Mccray | Appalachian State | 6-1 | 187 | 33.78 |
| T.J. McDonald | USC | 6-3 | 219 | -- |
| Bradley McDougald | Kansas | 6-0 | 215 | 32.48 |
| Leon McFadden | San Diego State | 5-10 | 193 | 32.38 |
| Brandon McGee | Miami | 5-11 | 193 | 32.08 |
| Rontez Miles | California-PA | 6-0 | 203 | 32.78 |
| Dee Milliner | Alabama | 6-0 | 201 | 32.08 |
| Zeke Motta | Notre Dame | 6-2 | 213 | 31.38 |
| Jordan Poyer | Oregon State | 6-0 | 191 | 31.68 |
| Bacarri Rambo | Georgia | 6-1 | 211 | 31.08 |
| Eric Reid | LSU | 6-0 | 213 | 33.58 |
| Greg Reid | Florida State | 5-8 | 190 | 29.68 |
| Xavier Rhodes | Florida State | 6-2 | 210 | 33.68 |
| Nickell Robey | USC | 5-7 | 169 | 29.68 |
| Logan Ryan | Rutgers | 5-11 | 191 | 31.38 |
| Tharold Simon | LSU | 6-2 | 202 | 32.68 |
| Jamoris Slaughter | Notre Dame | 6-0 | 195 | 31.38 |
| Darius Slay | Mississippi State | 6-0 | 192 | 32.28 |
| Daimion Stafford | Nebraska | 6-0 | 221 | 31.18 |
| Jawanza Starling | USC | 6-1 | 202 | 32.08 |
| Daxton Swanson | Sam Houston State | 5-10 | 186 | 30.38 |
| D.J. Swearinger | South Carolina | 5-11 | 208 | 32.38 |
| Rod Sweeting | Georgia Tech | 5-11 | 189 | 31.28 |
| Jamar Taylor | Boise State | 5-11 | 192 | 30.68 |
| Phillip Thomas | Fresno State | 6-1 | 208 | 30.58 |
| Shamarko Thomas | Syracuse | 5-9 | 213 | 31.48 |
| Desmond Trufant | Washington | 6-0 | 190 | 31.28 |
| Kenny Vaccaro | Texas | 6-0 | 214 | 32.68 |
| B.W. Webb | William & Mary | 5-10 | 184 | 30.28 |
| Kayvon Webster | South Florida | 5-10 | 195 | 32.48 |
| J.J. Wilcox | Georgia Southern | 6-0 | 213 | 31.08 |
| Duke Williams | Nevada | -- | -- | -- |
| Shawn Williams | Georgia | 6-0 | 213 | 30.68 |
| Steve Williams | California | 5-9 | 181 | 30.48 |
| Earl Wolff | N.C. State | 5-11 | 209 | 31.48 |
| Khalid Wooten | Nevada | 5-11 | 210 | 32.68 |
| Blidi Wreh-Wilson | Connecticut | 6-1 | 195 | 32.08 |