Marcus Mariota (Oregon) and Jon Gruden during Gruden's QB Camp class of 2015. Marcus Mariota during Gruden's QB Camp at the Wide World of Sports in Orlando. Gruden on Mariota: “Mariota is special in a lot of ways. He’s a dynamic dual-threat on the field and he is humble – no-nonsense, full of character off the field – 4.52 is what he ran [at the Combine]. He competes like crazy. I just think he has a lot of ‘can’t miss’ qualities.” Marcus Mariota filming a segment. Gruden’s QB Camp is back for its sixth year this spring, beginning Tuesday, April 7 (ESPN2, 7 p.m. ET).