The most Jean Segura Jersey anticipated 40-yard dash in the country Thursday turned out just fine for Clemson cornerback .Alexander, one of the top CB prospects in this year's NFL draft, sat out drills at the NFL due to a hamstring injury, which placed even more importance on his pro day. He ran between 4.48 and 4.52 seconds in the 40-yard dash on Thursday, per NFL Media draft expert Mike Mayock, who was in attendance for the pro day. A 4.48 would have placed him 13th at his position at the combine. He also had of 37.5 inches on Thursday, per NFL Media's Rand Getlin. That mark would have given him a tie for seventh place among CBs at the combine."(Scouts) definitely left with smiley faces," .Perhaps just as important as the 40 time, however, was Alexander's performance in position drills. Having started two years at CU without making an interception, his ball skills are perhaps the chief scouting question looming over his Yusei Kikuchi Jersey status for the NFL draft.NFL Media analyst Mike Mayock was impre sed."I think he made a case for being a first-round corner," Mayock said.Four NFL head coaches Brandon Brennan Jersey -- the ' Rex Ryan, the ' Chuck Pagano, the ' Marvin Lewis and the ' Mike Tomlin -- were in attendance for the workout. Pagano reportedly speaking with Alexander, and Tomlin with the Tigers' brash cover man, who insisted he is the best cornerback in the draft at the combine. A good impre sion on those two coaches could be particularly valuable for Alexander -- CB is a top need for both the and .Here are a few other things we learned from Thursday's pro days:Alexander wasn't the only main attraction at Clemson, Tom Murphy Jersey and two of the others were taken out of their comfort zones. Defensive ends and were asked to go through linebacker drills so scouts could see if they had the skills to drop into coverage, . ... More from Clemson's pro day: WR Charone Peake reportedly ran of 4.36 and 4.38 ... Dodd said he has been invited to .Mi si sippi State QB and DL were the biggest scouting draws at MSU's pro day Thursday, with Prescott throwing more than 60 pa ses under the watchful eyes of quarterback coaches Ken Dorsey of the and Randy Fichtner of the .Illinois DL , at nearly 300 pounds, turned in impre sive 40-yard dash times of 5.07 and 5.10 on Thursday as defensive line coaches from the , and were .Oregon's Byron Marshall, one of the Ducks' Jake Fraley Jersey most explosive and versatile offensive weapons, at the Ducks' pro day, while QB Vernon Adams ran a 4.85.*Follow Chase Goodbread on Twitter *.