The first day of Senior Bowl practices is in the books.

Several players stood out during the first session down in Mobile, including players on both sides of the ball.

Here are the Day 1 standouts from NFL.com's Lance Zierlein.

Malachi Fields, WR, Notre Dame

"Measuring 6-foot-4 and 218 pounds, Fields is the most physically imposing wideout at the Senior Bowl. While he didn't make highlight-reel catches on Tuesday (his American Team teammate Ted Hurst took care of that; more on him later), Fields did show off his ability to stack corners on vertical routes and body them out of contention on short/intermediate catches. He used his wide catch radius to pull in off-target throws, as well.

"Fields is a boundary bully who struggles to uncover against tight man coverage. He needs a more limited route tree with fewer breaks and bends, but once he gets top positioning, he's hard to beat. I'd like to see him continue to show he can make up for a lack of separation with contested catch wins in practice."

Kyle Louis, LB, Pittsburgh

"At a hair under 6-foot and just 224 pounds, Louis isn't built like the typical NFL linebacker. He operates as more of a nickel linebacker hybrid, taking downhill shots to make trouble for offenses as both a blitzer and gap-shooter.

"His skills in coverage set him apart, though. In one-on-one drills against running backs, Louis basically ran the option route for the runner and nabbed the quarterback's pass with his quick hands. He was tight in coverage throughout that portion of the practice, showing why he should be a rising prospect in this draft."

Derrick Moore, Edge, Michigan

"Moore steamrolled Miami OT Markel Bell with a well-leveraged bull rush during the American Team practice. He flashed again as a run defender, using his length and play strength during a scrimmage.

"Moore has average size, but he's a momentum-based pass rusher who gets into tackles first with a long-arm move that loosens the tackle's anchor and collapses the edge. He needs to play every snap with consistent urgency, but Tuesday's practice was a good reminder of what he's capable of in both phases."

T.J. Parker, Edge, Clemson

"There are some lingering concerns about Parker's decline in production in 2025, but Tuesday's practice was a win for the Clemson edge rusher. He unleashed his patented long-arm bull-rush move, which lifted Maryland's Alan Herron off his feet. Parker also won a rush rep with a good inside counter that took him straight into the pocket.

"Parker's power rush is a known commodity. However, teams will want to see more diversity in his rush approach. It will be interesting to see if Parker adds a wrinkle to his rush in the days ahead after setting the tone on Tuesday with his bona fide power move."

Sam Roush, TE, Stanford

"Roush is the prototypical "Y" tight end with the big, well-defined frame of a five-year NFL veteran. His arms measured much shorter than expected (31 inches), but that didn't keep him from doing his job as a run blocker in the practice reps I saw on Tuesday. He showed off good hand placement and consistent strain that will catch the eyes of evaluators when they watch the tape.

"Roush can handle possession throws and zone-beaters underneath, but he's not going to light up stat columns. He's the best pure drive blocker among tight ends in this year's draft, though. He needs to continue to prove it over the rest of the week to solidify his standing as a middle-round pick."