The NFL Combine is a fantastic opportunity for prospects to show off their athleticism in a controlled environment, in the hopes of securing or increasing their draft stock. Unfortunately, not every player is able to do himself a favor. Here are ten prospects who were unable to perform as well as they had hoped.

10. Zack Moss, RB, Utah

This comes with a caveat, as Moss reportedly tweaked his hamstring while doing his vertical jump and decided to push through the pain for his 40-yard-dash and shuttle. His pro day numbers will be important for determining just how much of an impact Moss's injury had during the Combine, but his performance was not great.

His 4.65 40 tied him for fourth-worst among all backs who ran. His vertical of 33″ was seventh-worst, and his 4.37 shuttle fourth-worst. Moss's running style is more power than speed, and he doesn't look slow on tape, so he needs to prove this was just a fluke. Pro Football Focus ranks Moss as the top back in this class, but at this point it's unlikely NFL teams will agree.

9. Calvin Throckmorton, OL, Oregon

Throckmorton played all along the line in college, and his versatility is perhaps his biggest selling point. But he may have to transition inside to guard and center full-time after a poor Combine. He measured in at 6'5″ 317lbs with 32 1/2″ arms, which was not a good start.

He proceeded to run the second-slowest 40, jumped an unimpressive 27″ in the vertical and the fourth-worst broad at 97″, ran the sixth-worst shuttle at 4.98, and the sixth-worst 3-cone at 8.07. At this point Throckmorton appears to be a Day 3 pick and at best a versatile backup.

8. Cameron Dantzler, CB, Mississippi State

Dantzler was getting some first-round buzz prior to the Combine, but his stock has since gone down. He measured 6'2″ 188lbs, which, although skinny, isn't too bad. The issue is his 30 5/8″ arms. Dantzler has height, but not length. He participated in only two drills, and impressed in neither. His 34.5″ vertical was tied for sixth-worst, and his 4.64 40 was tied for fifth-worst.

Not a good showing for Dantzler, and while his lack of speed isn't a death sentence, especially since his game is predicated more on physicality, it certainly doesn't do him any favors.

7. Bradlee Anae, EDGE, Utah

On tape, Anae doesn't appear to have great athleticism, and he did nothing to change that view. His 40 (4.93), vertical (31″), broad (115″), 3-cone (7.44), and shuttle (4.43) were all middling. His subpar run defense combined with subpar athleticism does not bode well for his stock.

He gives constant effort and had nearly 30 sacks and 40 tackles for loss over the past three seasons, so he should be able to carve out a depth role somewhere, but he won't be drafted early by an NFL franchise looking for instant pass-rush help.

6. Rashard Lawrence, DT, LSU

Lawrence participated in only three drills, and it's probably good that he did. He measured in at 6'2″ 308lbs, which is certainly less than ideal, but wouldn't be a problem if Lawrence was able to show he had solid explosion.

Unfortunately, he wasn't able to do that. Lawrence's 40 (5.07) and 3-cone (8.03) were subpar, his 3-cone in particular was fourth-worst among all defensive lineman. For a player whose strength is stopping the run, Lawrence's NFL Combine was not encouraging.

5. Jared Pinkney, TE, Vanderbilt

In a very weak tight end class, Pinkney was thought to have the potential to rise to the top. But injuries limited him to just 20 catches as a senior, and while he measured in at a solid 6'4″ 257lbs, Pinkney participated in just one on-field test, and it did not go well.

He ran the 40 in 4.96 seconds, the worst of any TE in attendance. Perhaps Pinkney will display agility at Vanderbilt's pro day, but at this point it doesn't look like Pinkney will be more than a depth H-back, and is probably a fifth-rounder at best.

4. Trey Adams, OT, Washington

Adams needed a good Combine performance to prove his knee and back injuries hadn't sapped him of his athleticism. Adams' college tape is still good, although he was much better as a freshman than he was as a senior. Adams was viewed as a potential top pick before his injuries took their toll. Unfortunately, Adams tested awfully.

He didn't end up participating in the 3-cone or shuttle, but would have likely just dug himself into a deeper hole. After his sophomore season, Adams would've likely been a first-round selection in the NFL Draft. Now, he'll be fortunate to be drafted at all.

3. Jerry Jeudy, WR, Alabama

Jeudy's Combine performance is puzzling. His 4.45 40 time was solid, but not the 4.3 he was hoping to run. His vertical (35″) and broad (120″) were fine, but his 4.53 shuttle ranks in the 3rd percentile of NFL receivers. Yet one look at Jeudy's tape shows a player with elite lateral agility.

His ability to stop and start on a dime is fantastic, but his testing numbers don't match that. This is a perfect example of why Combine testing isn't everything; should you throw away two seasons of great play and production because Jeudy didn't perform well in a drill? Of course not.

2. Laviska Shenault Jr., WR, Colorado State

Shenault Jr. was one of the more polarizing prospects in this class even before his disappointing Combine performance. At 6'1″ 227lbs, he's a terror for defensive backs to bring down, and has fantastic yards after catch ability. He's an RB playing WR, an offensive weapon. Shenault Jr. participated in just the bench press and 40, putting up 17 reps and running a 4.58, a less than stellar time.

Like Jeudy, Shenault Jr.'s testing doesn't exactly line up with his game film. After the Combine ended, reports surfaced that Shenault Jr. would undergo core muscle surgery, an injury that no doubt impacted his 40 time. How much exactly remains to be seen. Teams will need to to their homework and determine how much he was really held back.

1. A.J Epenesa, EDGE, Iowa

Originally the second-best defensive end prospect after Ohio State's Chase Young, Epenesa is now third, if that. While players like K'Lavon Chassion and Julian Okwara ooze athletic potential, Epenesa is a rock-solid power end with a low NFL ceiling. He has great size at 6'5″ 275lbs, but is not explosive.

A.J. Epenesa Relative Athletic Score

Epenesa has never relied on his athleticism to win, however. He plays with good strength and solid technique. Is he worth taking in the top 10? Probably not; teams will want more potential out of their top pick. But Epenesa's film still shows an excellent player. He may never be an elite player in the pros, but his floor is very high.