Martin Mayhew's update on 's contract negotiation wasn't much of an update. Combine on NFL NetworkIn advance of the draft, Marcus Mariota and others will look to showcase their skills at the combine (Feb. 17-23), only on NFL Network. "It's not done," the general manager said Wednesday from the NFL . "(We're) still working on it. Still very optimistic we'll be able to get it done." Mayhew would...