Was Peyton Manning's performance the worst ever by a Super Bowl winner?
A Statistic Behind Every Super Bowl Contender - The New York Times
Peyton Manning Had The Worst Season Of Any Super Bowl Quarterback Ever
The Denver Broncos win one of the worst Super Bowls ever.
Peyton Manning to retire after 18 NFL seasons
The 16 Worst Quarterbacks in NFL History Were Painful to Watch - FanBuzz
Ranking the top 5 worst Super Bowls – The Denver Post
Peyton Manning's rank among QB greats, according to SN NFL experts
Peyton Manning's Case for Being the Best Ever - The New York Times