Former UAB wide receiver J.J. Nelson's 4.28 40-yard dash time, the fastest at the NFL Combine, could have reaped the Midfield High School alumnus some serious material benefits.

Instead, the the lightest player to participate in the combine in more than a decade will have to settle for bragging rights and an increased NFL Draft stock.

Adidas originally offered Porsche 911s as rewards but had to switch up its offer because it conflicted with the league's sponsorship deal with General Motors, according to ESPN's Darren Rovell. Nelson's blistering time, which came as a surprise to many but not his his former coaches and teammates, would've put him in line for the cash but he didn't sign with Adidas before running, a company spokesperson told ESPN.

Nelson ran the 40 in Adidas cleats then switched to a pair of green and white Nike cleats that looked much like the ones he wore throughout his All-American senior season at UAB for on the on-field drills during the combine.

Adidas endorsers Michigan State cornerback Trae Waynes (4.31), Miami wide receiver Phillip Dorsett (4.33) and West Virginia wide receiver Kevin White (4.35) all took home $100,000 checks for their times.

Homewood High School product former Nebraska running back Ameer Abdullah has also signed with Adidas.

Click here to watch Nelson's sprint, courtesy of NFL.com