Accustomed to going under the knife, Peyton Manning is now under the microscope of several NFL teams. A contingent of Denver Broncos officials were the latest to study the free-agent quarterback Friday, watching Manning work out in Durham, N.C. Manning also is expected to work out for the Tennessee Titans, though the specific day is not known, sources said. He has also hosted the San Francisco 49ers in Durham for drills, sources told ESPN senior NFL analyst Chris Mortensen and ESPN NFL Insider Adam Schefter. Read more: http://espn.go.com/nfl/story/_/id/7...ncos-watch-peyton-manning-work-north-carolina
