4. Mark Clayton – 3,116 receiving yards
Mark Clayton was drafted by the Baltimore Ravens in the first round of the 2005 NFL Draft as the 22nd overall pick out of the University of Oklahoma. He had performed extremely well in college, earning first-team All American nominations and setting the career receiving yards record for Oklahoma.
During his time in Baltimore, Clayton was reasonably productive but never turned into the number one receiver that he was drafted to be.
His best season came in 2006, his second year with the team, ending the year with 67 catches for 939 yards and five touchdowns.
He never matched that level of production again and struggled with injuries on and off for the remainder of his career. Eventually, landed with the St. Louis Rams and spent his final two seasons there before retiring after the end of the 2011 season.