1. Adrian Peterson, RB, 2004: Peterson came to Norman with hype and under pressure few freshmen have to deal with, and performed magnificently. He rushed for an OU-record 1,925 yards, scored 15 touchdowns and was the Heisman Trophy runner-up for the Sooners. After his freshman year, he struggled through injuries while still posting impressive numbers as a sophomore and junior before bolting for the NFL.
2. Marcus Dupree, RB, 1982: A man-child who forced his way into OU's lineup — and forced Barry Switzer into a different offense — midseason and rushed for 1,144 yards and 13 touchdowns. The second-team All-American rushed for 239 yards in a Fiesta Bowl loss, eliciting criticism from the coach for being out of shape. He transferred to Southern Miss early the next season, never played there and had a brief, unsuccessful pro career.
3. Jamelle Holieway, QB, 1985: Holieway began playing in the fourth game, when Troy Aikman broke his leg in a loss to Miami. Holieway rushed for 862 yards and nine TDs and threw for six scores, and OU finished the season 11-1 and won the national title. His sophomore year was outstanding, and he was great as a junior, too, until a late-season ACL tear. He injured his ankle as a senior and lost his job to Charles Thompson.
4. Tommie Harris, DT, 2001: In Harris' first college football game, he made a tackle for loss against North Carolina. It was the first of 17 he recorded as a freshman, when Harris was a first-team All-Big 12 selection and a freshman All-American. He was a consensus All-American as a sophomore and junior, winning the Lombardi Award as the nation's top defensive linemen in 2003, his junior year and final season in Norman.
5. Joe Washington, RB, 1972: In the middle of the first season where freshmen were eligible, Washington became OU's left halfback in the wishbone, opposite Greg Pruitt. He rushed for 630 yards and seven touchdowns, including one in a 17-14 win over Nebraska. The College Football Hall of Famer and two-time All-American went on to one of the all-time greatest OU careers, rushing for 4,071 yards and 39 TDs.