Jameis Winston throws at combine

— -- Jameis Winston and Marcus Mariota, who each promised to do the full workout at this year's NFL scouting combine, kept their word Saturday as both quarterbacks went through the paces at Lucas Oil Stadium.

And in what will be a constant exercise in comparison shopping until the NFL draft April 30, the best quarterback prospects in this year's class showed themselves to be well prepared for a big-stage moment.

Throwing in the orchestrated drills of the combine to an unfamiliar group of wide receivers, with all dealing with the adrenaline of the moment, often can be a difficult thing for all involved.

But both Winston and Mariota each showed an easy throwing motion, deep-ball accuracy and competed well in the drills.

Winston's work was given particular attention since concerns arose over some weakness in his throwing shoulder during the extensive medical exam players receive at the combine. In addition to the usual assessment by every team's medical staff that all players at the combine receive, Winston was also sent for an MRI on his shoulder.

Some scouts wondered Friday night whether Winston would still throw, given a player who had his throwing shoulder examined as extensively as he did would likely experience some kind or soreness. But the 2013 Heisman Trophy winner threw as scheduled.

Winston said Friday that he was not concerned about the attention being paid to his shoulder.

"I had an MRI, just like everyone else," the former Florida State star said. "I've been playing football for, since I was 4 years old, and my shoulder has been fine."

Of the top quarterback prospects, only Colorado State's Garrett Grayson, who suffered a hamstring injury Feb. 10 in a pre-combine workout, did not participate in Saturday's workout.

Mariota showed top-tier athleticism, having run one of his 40-yard dashed in 4.52 seconds -- or faster than 10 of the wide receivers who ran in their workouts Saturday -- to go with a 36-inch vertical jump and a 10 foot, 1-inch broad jump. He had the fastest 40-yard dash time among all 15 quarterbacks.

Winston, at 231 pounds, ran his two 40s in 4.97 and 4.99 seconds, respectively, to go with a 28 ½-inch vertical jump and a broad jump of 8-7.

Alabama-Birmingham receiver J.J. Nelson had the fastest overall 40, a 4.28, falling just short of Chris Johnson's combine record (4.24). Miami's Phillip Dorsett was next at 4.33. West Virginia receiver ]certainly helped his case by running a 4.35 while Alabama's Amari Cooper was clocked at 4.42.

Heisman Trophy finalist Melvin Gordon had the fifth-fastest time among running backs at 4.52. Michigan State's Jeremy Langford was No. 1 at 4.43.

Information from The Associated Press was used in this report.