Crimson Countdown: QB Baker Mayfield

During the summer months, ESPN.com will take a closer look at each scholarship player on Oklahoma’s roster in our Crimson Countdown series. Each day, we will analyze each player’s impact on the program since arriving on campus, his potential impact this fall, and his long-term projection. Starting with No. 1 Dominique Alexander, the series will follow the roster numerically through our final analysis of No. 98 Chuka Ndulue.

No. 6 Baker Mayfield, quarterback, 6-foot-2, 215 pounds, sophomore

Impact thus far: As a spring transfer, he has had zero impact on OU. But he had major impact on the Big 12 Conference as a walk-on true freshman at Texas Tech, earning Big 12 Freshman of the Year honors before his decision to transfer to OU. He passed for 2,315 yards, 12 touchdowns and nine interceptions in 2013.

Impact in 2014: He will be sitting out the 2014 season due to transfer rules. But he could still help the Sooners this fall as one of the best scout-team quarterbacks in the nation and will provide a quality test for OU's starting defense each week as it prepares for games each Saturday.

Long term upside: Mayfield is the most proven quarterback on the roster after starting seven games for the Red Raiders in 2013, so he could provide quality competition for Trevor Knight when he becomes eligible to play for the Sooners. Mayfield's unwavering confidence in his own abilities makes it unwise to count him out, no matter how Knight plays this fall. At the very least, Mayfield brings an upgrade to the overall talent in the quarterback room.

Evaluation grade for Mayfield: C. After leaving Texas Tech, Mayfield decided to walk on and join the program because he was a childhood fan of the Sooners. OU could have signed Mayfield out of high school but signed Cody Thomas instead. However, it's hard to hold that against the Sooners as Thomas looks like he could become a quality quarterback in his own right.

Development grade for Mayfield: N/A. Mayfield has been on campus for only one semester and isn’t eligible until 2014.

Quotable: “Baker looks good. You can tell he’s played. It’s obvious he’s been on the field when you watch him play. He looks comfortable and makes plays.” — Bob Stoops during spring football.