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LSU defensive back Donte Jackson (1) and LSU safety Grant Delpit (9) celebrate after breaking up a pass in the first half, Monday, January 1, 2018, in the Citrus Bowl at Camping World Stadium in Orlando, Fla.

Advocate staff photo by HILARY SCHEINUK

INDIANAPOLIS — Donte Jackson isn't chasing D.J. Chark.

He wants John Ross

Jackson, the LSU cornerback who doubled as a member of LSU's SEC Champion 100-meter relay, openly declared his aim in Monday's NFL scouting combine: to break the 40-yard dash record of 4.22 seconds, set last spring by Ross.

"If you were fast, wouldn’t that be a goal for you?" Jackson asked. "Exactly. That’s just competitive nature in me. I’m going to get out the bed, and I’m going to be ready to run and beat it."

With one day left in the combine, the fastest time any prospect has charted so far is 4.34 seconds, set by Chark, Jackson's teammate at LSU. 

"D.J. Chark is not going to beat me," Jackson said. "4.34? I can run that not stretching."

A record-breaking 40 would bring Jackson an incredible amount of attention, but there are tangible benefits to such a performance. Ross was projected to be a late first-round, early second-round pick at this time a season ago; he was picked No. 9 after his run broke Chris Johnson's famous record of 4.24 seconds. 

What Jackson is trying to do is no easy task. Few prospects can break the 4.3-second mark, let alone make a run at Ross's blistering time. 

Jackson isn't worried about breaking 4.3. He's focused firmly on Ross. 

"Don’t blink," Jackson said. "You’re going to miss it.”

Follow Joel A. Erickson on Twitter, @JoelAErickson.