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The 2013 NFL Draft will be won or lost in the trenches.

That’s where the bulk of the best talent resides and where the teams making the best choices will get richer.

“I’ve got six offensive tackles with first-round grades, and I’ve got six defensive tackles with first-round grades,” said NFL Network analyst Mike Mayock.

There probably won’t be a receiver picked in the top 10. There may not be a running back picked in the top 20. The offensive and defensive lines will rule over the skill positions.

Here’s a position-by-position look at the offensive prospects, broken into tiers, which are not meant to be definitive. In other words, the top tier includes players who are potential first-round picks, not just the top 32. Rounds two and three will be held on Day Two. Only selected third-day prospects are included.

QUARTERBACKS

Class Grade: B-

Geno Smith has the best combination of size, strength and production. He threw for 42 touchdowns and runs a 4.59-second 40-yard dash. There are questions about his ability to read defenses and pocket presence. He needs to take better care of the ball (32 career fumbles). ... Ryan Nassib is an underrated athlete with sufficient arm strength to all parts of the field. He played in an offense that transitions well to the NFL. His footwork can break down, resulting in poor accuracy.

Matt Barkley might have been a top-10 pick in 2012, but came back and had a disappointing senior season that ended because of a shoulder injury. ... E.J. Manuel has all the physical tools and would look good running the read option, but he’s woefully inconsistent. ... Mike Glennon came on at the end of 2012. He’s got a good arm and can work from under center, but can be inaccurate at times. ... Tyler Wilson’s got all the leadership qualities you want in a quarterback, but he’s got a slow delivery. ... Tyler Bray would have benefited from another year in school. He might have the best arm in the class, but is immature. ... Landry Jones has good size and production, but breaks down under pressure.

Matt Scott is a dual-threat quarterback with a strong arm. He has to work on his decision making. ... Collin Klein was a Heisman candidate who threw for 16 touchdowns and ran for another 23. ... Jordan Rodgers is the younger brother of Green Bay quarterback Aaron.

OFFENSIVE LINE

Class Grade: A

Luke Joeckel, Eric Fisher and Lane Johnson could go within the top seven picks. They’ve all got potential to start on the left side for the next decade. Fisher just continues to grow. He’s a slightly better athlete than Joeckel. Johnson started in junior college playing quarterback. … Chance Warmack and Jonathan Cooper are the rare guards who could go in the top half of the first round. … D.J. Fluker probably doesn’t have the feet to play on the left side, but he’s a road grader at right tackle.

Menelik Watson will be 25 as a rookie. He’s from England and didn’t take up football until giving up a basketball career at Marist. … Larry Warford also played basketball and has good feet. He plays with a nasty streak. ... Justin Pugh will likely transition from left tackle to guard in the NFL. … Terron Armstead blew away the combine with a 4.71 40 and 34.5-inch vertical. … Kyle Long is the son of former Raiders great Howie and brother of Rams defensive end Chris. … Travis Frederick is the top-rated center in the draft.

J.C. Tretter is a native of Akron who played the last two years at left tackle. He’ll likely move inside to guard or center. He’s a good athlete and smart player. … Brian Winters is an All-Mid-American Conference player who operated a snowplow business while at Kent State. He tweaked a pectoral injury at the combine. … Reid Fragel’s a converted tight end who needs to add some weight to his tall frame.

RECEIVERS

Class Grade: B

Cordarrelle Patterson has the tools to be an elite, big playmaker, but may need some time to mature. ... Keenan Allen, the half-brother of former UB QB Zach Maynard, is ready to step in and produce. He can run after the catch. ... Tavon Austin runs a 4.34 40. He’s a faster Roscoe Parrish. ... Robert Woods is a smooth veteran with 210 catches. ... DeAndre Hopkins, Terrance Williams and Quinton Patton are outside possession receivers who have produced. Their numbers: Hopkins 206 catches, 27 TDs; Williams 202 catches, 27 TDs; Patton 183 catches, 24 TDs. ... Justin Hunter is bigger, more slender and faster (4.44). ... Markus Wheaton is fast (4.45) and thin. ... Ryan Swope (4.34) is a speedier Brandon Stokley. He’s strictly a slot receiver. ... Da’Rick Rogers has elite size and speed (4.44) and is a first-round talent but got booted out of Tennessee (not an easy feat) for failing drug tests.

Marquise Goodwin placed 10th in the long jump at the 2012 Olympics in London and ran 4.27 in the 40. He caught 30 passes a year over four seasons for Texas. ... Josh Boyce ran 4.38 but has a fractured foot. ... Cobi Hamilton had 90 catches last season, 65 more than any other teammate, but isn’t speedy (4.56). ... Steadman Bailey doesn’t have special size or speed but caught 25 TDs in 2012. ... Denard Robinson, who went 23-12 as QB at Michigan, holds the major-college record for rushing yards by a QB (4,495). He ran 4.34 and will try to play WR in the NFL. ... Jasper Collins comes from the Division III powerhouse that produced Pierre Garcon and Cecil Shorts. He was snubbed by the combine but ran 4.47 on campus.

TIGHT ENDS

Class Grade: B

Tyler Eifert projects as a solid but unspectacular NFL starter. He has good hands and some blocking ability. ... Zach Ertz should be picked late in the first or in the first half of the second round. He ran well on campus (4.62) and seems like a sure-fire solid player. He had 69 catches and nine TDs last season. More of a receiver than a blocker. ... Gavin Escobar, like Ertz, is more of a receiver than a blocker. He’s a three-year starter with a big frame who adjusts well to the ball. It’s a close call between Escobar and McDonald, who is stronger but who was used mostly split out by Rice. Vance McDonald’s 31 bench-press lifts of 225 pounds were the fourth best in the past 10 years among TEs. ... Travis Kelce is an impressive physical talent who caught 45 passes for a 16-yard average with eight TDs last season. He’s rugged and has some play-making ability after the catch. How will teams evaluate him? He was suspended for the entire 2010 season for violating unspecified team rules. He’s recovering from a sports hernia operation. ... Jordan Reed is a big slot receiver in the Dustin Keller mold but he’s slower (4.53 for Keller, 4.72 for Reed).

Ryan Otten caught 99 passes the past two years. ... Levine Toilolo is a big target but lacks quickness. ... The wide-bodied Sims is the best blocking TE in the draft. ... Nick Kasa is a converted defensive end. Last season was his first full year at TE, and he caught 25 passes. He’s powerful but not smooth, a tad stiff in the hips. ... Joseph Fauria isn’t fast or strong but had 12 TD catches last season and could be a viable backup. ... Jake Stoneburner, strictly a catcher, ran 4.65. ... Zach Sudfeld ran decent times at his pro day (4.71 and 4.77) and caught 45 passes and nine TDs in the Pistol offense. He’s worth bringing to camp.

RUNNING BACKS

Class Grade: B

Alabama’s Eddie Lacy is a load – just ask Notre Dame LB Manti Te’o, bulldozed by Lacy in the national title game. ... Wisconsin’s Ball scored a record 83 TDs in his career. He has miles on his tread (924 college carries). ... The Spartans’ Le’Veon Bell can be a solid starter. He was third in the nation in rushing, had 33 career TDs, and gets yards after contact. ... Bernard is another all-purpose back. He has 92 catches the past two years. ... Andre Ellington is undersized but tough. He’s starting-caliber and averaged 5.8 yards a carry for his career. ... Texas A&M’s Christine Michael is a stud athlete, with a 43-inch vertical jump. He got hurt in 2010 and 2011 and spent much of 2012 in his coach’s doghouse.

Franklin is productive but has fumbling issues. ... Oklahoma State’s Joseph Randle is a third-down back. ... South Carolina’s Marcus Lattimore is coming off a Willis McGahee-type knee injury. ... Oregon’s Kenjon Barner was fourth in the nation in rushing. ... Stanford’s Stepfan Taylor does everything well but lacks top-end speed. ... Kyle Juszcyk caught 52 passes for the Crimson last season, mostly as a tight end. He will be the first Harvard player drafted since Ryan Fitzpatrick in 2005. ... Khiry Robinson, of West Texas A&M, rushed for 1,621 yards last season and had a 35-inch vertical jump.

QUARTERBACKS

Day One

Name, School Ht. Wt.

Geno Smith, West Virginia 6-2 218

Ryan Nassib, Syracuse 6-2 227

Matt Barkley, USC 6-2 227

Day Two

E.J. Manuel, Florida State 6-5 237

Mike Glennon, N.C. State 6-7 225

Tyler Wilson, Arkansas 6-2 215

Tyler Bray*, Tennessee 6-6 232

Landry Jones, Oklahoma 6-4 225

Day Three

Zac Dysert, Miami (Ohio) 6-3 231

Matt Scott, Arizona 6-2 213

Sean Renfree, Duke 6-3 219

Jordan Rodgers, Vanderbilt 6-1 212

Collin Klein, Kansas State 6-5 226

Brad Sorensen, Southern Utah 6-4 229

Sleeper

Jeff Tuel, Washington State, 6-3, 221

OFFENSIVE LINE

Day One

Name, School Ht. Wt.

Luke Joeckel* (T), Texas A&M 6-6 306

Eric Fisher (T), Central Michigan 6-7 306

Lane Johnson (T), Oklahoma 6-6 303

Chance Warmack (G), Alabama 6-2 317

Jonathan Cooper (G), North Carolina 6-2 311

D.J. Fluker* (T), Alabama 6-5 339

Day Two

Larry Warford (G), Kentucky 6-3 332

Menelik Watson* (T), Florida St. 6-5 310

Justin Pugh* (T), Syracuse 6-4 307

Terron Armstead (T), Arkansas Pine-Bluff 6-5 306

Kyle Long (T), Oregon 6-6 313

Travis Frederick* (C), Wisconsin 6-4 312

Dallas Thomas (G/T), Tennessee 6-5 300

Oday Aboushi (G), Virginia 6-5 308

Day Three

J.C. Tretter (G/C), Cornell 6-4 307

Brian Winters (G), Kent St. 6-4 320

Brian Schwenke (C), Cal 6-3 314

Reid Fragel (T), Ohio State 6-8 308

Barrett Jones (C), Alabama 6-4 306

Khaled Holmes (C), USC 6-3 302

Earl Watford (G), James Madison 6-3 300

Sleeper

Luke Marquardt (T), Azusa Pacific 6-8 315

RECEIVERS

Day One

Name, School Ht. Wt.

Tavon Austin, West Virginia 5-8 174

Cordarrelle Patterson*, Tennessee 6-2 216

Day Two

DeAndre Hopkins*, Clemson 6-1 214

Keenan Allen*, California 6-2 206

Robert Woods*, Southern Cal 6-0 201

Terrance Williams, Baylor 6-2 208

Quinton Patton, Louisiana Tech 6-0 204

Justin Hunter*, Tennessee 6-4 196

Ryan Swope, Texas A&M 6-1 205

Markus Wheaton, Oregon State 5-11 189

Da’Rick Rogers, Tennessee Tech 6-3 217

Aaron Dobson, Marshall 6-3 210

Chris Harper, Kansas State 6-1 229

Day Three

Marquise Goodwin, Texas 5-9 183

Tavarres King, Georgia 6-1 189

Josh Boyce, Texas Christian 5-11 206

Steadman Bailey, West Virginia 5-10 193

Cobi Hamilton, Arkansas 6-2 212

Marcus Davis, Virginia Tech 6-3 233

Corey Fuller, Virginia Tech 6-2 204

Denard Robinson, Michigan 6-3 199

Sleeper

Jasper Collins, Mount Union 5-10 180

TIGHT ENDS

Day One

Name, School Ht. Wt.

Tyler Eifert, Notre Dame 6-5 250

Day Two

Zach Ertz*, Stanford 6-5 249

Vance McDonald, Rice 6-4 267

Travis Kelce, Cincinnati 6-5 255

Gavin Escobar*, San Diego St. 6-6 254

Jordan Reed*, Florida 6-3 236

Day Three

Ryan Otten, San Jose St. 6-5 242

Dion Sims*, Michigan St. 6-5 262

Nick Kasa, Colorado 6-6 269

Joseph Fauria, UCLA 6-7 259

Levine Toilolo*, Stanford 6-8 260

Jake Stoneburner, Ohio State 6-3 252

Mychal Rivera, Tennessee 6-3 242

Sleeper

Zach Sudfeld, Nevada 6-7 253

RUNNING BACKS

Day One

Name, School Ht. Wt.

Eddie Lacy*, Alabama 6-1 220

Day Two

Montee Ball, Wisconsin 5-11 214

Le’Veon Bell*, Michigan St. 6-1 230

Christine Michael, Texas A&M 5-10 220

Giovanni Bernard*, North Carolina 5-8 202

Andre Ellington, Clemson 5-10 199

Day Three

Johnathan Franklin, UCLA 5-10 205

Joseph Randle*, Oklahoma St. 6-1 204

Marcus Lattimore*, South Carolina 5-11 221

Kyle Juszcyk (FB), Harvard 6-1 248

Stepfan Taylor, Stanford 5-9 214

Kenjon Barner, Oregon 5-9 196

Lonnie Pryor (FB), Florida St. 6-0 227

Kerwynn Williams, Utah St. 5-8 195

Mike Gillislee, Florida 5-11 208

Sleeper

Khiry Robinson, West Texas A&M 5-10 206

* - underclassman