Scott ran for 197 yards in his first college start, and Maryland overcame a lackluster passing game to escape with a 14-7 victory.
Scott carried 26 times and had runs of 40, 37 and 26 yards. The 5-foot-11, 192-pound sophomore totaled 137 yards rushing last season in nine games as a backup.
"We came in with the game plan that we were going to load up and run the ball, so I was pretty prepared for it," Scott said. "I just wanted to let people know what I can do -- and help my teammates out."
The last Maryland player to gain that much yardage on the ground was Bruce Perry, who had 237 against Wake Forest on Nov. 29, 2003. Scott's performance tied for 16th on the school's single-game rushing chart.
"We wanted to get Da'Rel Scott some confidence, and once he got it, he was gone," Maryland center Edwin Williams said.
Yet Maryland coach Ralph Friedgen thought Scott could have done even better.
"To me, he was a little tired from camp," Friedgen said. "Normally, he would break some of those runs. I don't think he quite had his third gear today."
Maryland finished with 271 yards rushing and only 126 yards through the air. The Terrapins also missed three field goals in an unexpected struggle against Delaware, which has 14 starters back from last year's team that advanced to the Football Championship Subdivision title game.
"We probably ran the ball better than I thought we would run the ball, but we probably didn't throw it as well as we have been throwing it," Friedgen said.
Jordan Steffy started at quarterback for the Terrapins, but after going 10-for-18 with two second-half interceptions, the fifth-year senior was replaced in the fourth by Chris Turner (1-for-3, 11 yards). Josh Portis also played the position, running four times for 10 yards.
Friedgen said Steffy was removed because of a right thumb injury, but acknowledged that the offense struggled after halftime.
"I thought he played pretty good in the first half," Friedgen said. "I know he can play better than he did in the second half."
Steffy's first two passes of the season were completed, but Maryland's initial drive ended when a 48-yard field goal try by former Westside standout Obi Egekeze hit the crossbar.
Egekeze also missed a 44-yarder before the Terrapins finally broke through in the second quarter. Heyward-Bey made a leaping catch for a 36-yard gain, then ran around right end for a touchdown.
After Delaware missed a field goal try, Egekeze was wide right from 41 yards as the half ended.