Corey Nelson is the next man up for the Broncos, who will be without Brandon Marshall on Sunday as he deals with a lingering hamstring injury that he reaggravated in Jacksonville. Nelson filled in admirably in his place, but the challenge gets tougher this weekend against the Titans. Running back DeMarco Murray ranks second in the NFL in rushing yards through 13 weeks, behind only Cowboys rookie Ezekiel Elliott. Murray, who himself was once a Cowboys standout, has rewarded the Titans' faith in him. He's racked up 1,043 yards and the entire offense runs through him. If the Broncos want to leave Tennessee with a win, they'll need to force the Titans into third-and-long and limit their opponent's time of possession. If the Broncos defense can't do that, they may be in for a long day.