Lining up beside starting quarterback Kyle Padron, Fields patiently waited for the snap.
"It was a pretty big deal. I was sort of jumpy and hoppy about it," recalled Fields after practice.
The ball was snapped and the running back took five hard steps to the left sideline. He then turned around and caught the ball near the line of scrimmage.
Two years ago it might have been a three to four yard pickup for a SMU back. Not for Fields.
Showing a glimpse of his speed that Mustangs fans have patiently been waiting for since he committed, Fields ducked his head and went up field.
About 12 yards later it was over. Just a 1st down, but a major step in the freshman's progression.
"It made me feel really good," said Fields. "I made the play I needed to."
Everyone expects the former Scout.com 3-star back to take over as the starter at some point in the season, but many fans are wondering if he will be ready to be the guy against Texas Tech.
"I'm really starting to pick up the offense," said Fields. "There is a big difference between high school and college football. In high school, great players take plays off because of their talent. In college, especially here, you can't do it."
The state of Oklahoma's best prep running back in 2009, Fields finished last year with 1495 yards and 30 touchdowns for Madill.