Oklahoma defensive lineman and wide receiver are high-risk Edwin Diaz Jersey , high-reward prospects in the NFL draft this year, but either one could be a first-round pick, according to NFL Media analyst Mike Mayock. Asked who could be "boom or bust" propositions for NFL clubs, Mayock identified Phillips, the 6-foot-4, 335-pound Sooners giant who has just one full season as a college starter on his resume, and Green-Beckham, who hasn't played since 2013 and spent last year on the practice field at OU under NCAA transfer rules."Back surgery two years ago, only Carlos Gomez Jersey started 16 games in college, but he's a dancing bear, and he'll probably go in the first round," , referring to Phillips.As for Green-Beckham, NFL clubs will have more than a few questions about the disciplinary record -- including an allegation of violence against a female -- that Francisco Lindor Jersey got him ousted at Mi souri. But Mayock suggested the 6-6, 225-pounder has a long way to go to refine his game on the field, as well."I watched every target to him in 2013, and he has no idea what he's doing, but he changes games," Mayock said.Green-Beckham caught 59 pa ses for 883 yards and 12 touchdowns as a sophomore at Mi souri in 2013, but was 10 months ago for his involvement in a burglary investigation Darryl Strawberry Jersey and transferred to OU. He entered the draft as a third-year sophomore.Often it's the most succe sful NFL clubs picking toward the end of the first round who are most willing to take a chance on a player whose raw Tom Seaver Jersey talent might rate very high, but slips due to various concerns. project Phillips as a first-round pick, but none higher than No. 19 overall. Two have Green-Beckham getting a first-round call, but neither higher than No. 18.*Follow Chase Goodbread on Twitter *.