4 spot in the "NFL 100 Greatest" ranking of the "NFL 100 Greatest" counts down the top 100 characters in NFL history, and Carolina Panthers quarterback Cam Newton lands at No. 90. "NFL 100 ...

"NFL 100 Greatest" counts down the top 100 characters in NFL history, and former Chicago Bears linebacker and San Francisco 49ers head coach Mike Singletary lands at No. 74. "NFL 100 Greatest ...

Editor's note: Our series on the greatest NFL teams of all time continues with its seventh installment and a look at the 1989 49ers. The greatest team ever will be revealed on Tuesday, May 15.