Draft risers from Day 4 of the NFL combine

INDIANAPOLIS -- Cornerbacks and safeties were put through the gantlet on final day of drills at the NFL combine. Below we'll highlight six lower-ranked prospects who helped their stock the most with their testing results, while Todd McShay hits on the bigger names.

Gareon Conley, CB, Ohio State

Rank entering combine: No. 46 overall

Conley's arms measured 33 inches, which is extremely long for cornerbacks. Love that. He has good overall size, too (6-foot, 195). Yes, he needs to continue to get stronger (just 11 reps on the bench), but some of that is a product on his long arms. He also tested well above average for the position in the vertical (37 inches) and broad jumps (10 feet, 9 inches). Conley's technique is really clean on tape, and that showed up during drill work on Monday. He tracked and played the ball really well. Combine the on-field work and tape with his impressive 40-yard dash (4.44), and Conley should be moving up boards. It wouldn't be a surprise to see the CB sneak into the bottom of the first round.

Obi Melifonwu, S, Connecticut

Rank entering combine: No. 40 overall

We identified Melifonwu as one of the players we thought would work out well at the combine, and he didn't disappoint. He posted the fastest time in the 40-yard dash (4.40) for the safeties, plus no one jumped higher (44-inch vertical) or farther (11-foot-9 broad jump) than him. Those numbers are impressive on their own, but they are that much more remarkable for a player who measured 6-foot-4 and weighed in at 224 pounds with 32.5-inch arms. That athleticism and speed showed during position drills, where he looked fluid and caught the ball well. It's shaping up to be an outstanding safety class, and Melifonwu has made the most of the pre-draft process to help himself. He flashed the week of the Senior Bowl and is living up to the lofty expectations people had set for him going into Indianapolis.

Josh Jones, S, NC State

Rank entering combine: No. 72 overall

Jones made our pre-combine list of this draft's biggest freak athletes, and he did not disappoint on Monday. At 6-foot-1 and 220 pounds, Jones has good size for a safety, and he had a 4.41 40-yard dash, a 37.5-inch vertical and an 11-foot broad jump. Those are insane numbers for that size. You see that kind of explosiveness and speed on his tape too. Heck, he ran down Heisman-winning QB Lamar Jackson from across the field during the Louisville game. Jones is an interchangeable safety who can play in the box, in center field and on the perimeter against bigger tight ends. Those kind of defenders are extremely valuable in today's NFL. Jones looked pretty fluid during drills for his size, and he very well could work his way into the top-50 picks after his performance on Monday.

Fabian Moreau, CB, UCLA

Rank entering combine: No. 205 overall

Moreau ran the second fastest 40 (4.35) for the defensive backs and had a 38-inch vertical. Only Melifonwu jumped farther than Moreau did, as the former Bruin recorded a 11-foot-4 broad jump. He ran the seventh-fastest short shuttle (4.12) and moved well for a 6-foot, 206-pound corner during position drills. Moreau has average length for a corner and didn't look like a natural pass-catcher during position drills, which is notable because he wasn't much of a playmaker at UCLA. However, he showed good focus tracking the ball and looked it into his hands during position drills.

Jalen Myrick, CB, Minnesota

Rank entering combine: NR

The 5-foot-10 200-pound Myrick ran the fastest 40 (4.28) for the defensive backs, and the second fastest time overall. He has good length for his frame (31-and-five-eighths arms), and he elevates well as he recorded the eighth best vertical (37.5 inches) for the defensive backs. There are concerns about Myrick's fluidity, however. He looked tight at times during position drills, plus his short shuttle (4.22) and three-cone times (7.06) are both slower than the five-year combine averages for corners. However, his speed is sure to pique the interest of teams looking to add depth at corner on Day 3, and his ability to make an impact in the return game will help his cause.

Ahkello Witherspoon, CB, Colorado

Rank entering combine: NR

Witherspoon ran a 4.45 40 and recorded the third-highest vertical (40.5 inches) for the defensive backs. At 6-foot-3 and 198 pounds, he's high-cut and not as fluid as some of the smaller corners. However, he moved well for his size during position drills plus his short shuttle (4.13) and three-cone (6.93) times ease concerns about his change of direction skills. He also has outstanding length (33-inch arms) so he doesn't have to be in perfect position and it's easy to see how he led the nation with 22 pass breakups last year. While he intercepted just one pass last season, there's reason to believe he could develop into more of a playmaker considering he has big hands (almost 10 inches) and showed the ability to high-point the ball during position drills.

Shaquill Griffin, CB, Central Florida

Rank entering combine: NR

Griffin wasn't talked about a lot coming into the combine -- we still need to watch his tape -- but he gave evaluators plenty of incentive to go study him more with his performance on Monday. Griffin ran a 4.38 40-yard dash at 6-foot and 194 pounds, and he was one of the biggest standouts during drill work. He was quick transitioning out of breaks and really clean catching the football in the gauntlet drill. Griffin had 15 pass breakups and four interceptions last season, and we're excited to take a closer look at him on film.