September 9, 2012; Denver, CO, USA; Denver Broncos quarterback Peyton Manning is greeted on the field by coach John Fox (right) during the fourth quarter against the Pittsburgh Steelers at Sports Authority Field at Mile High. The Broncos won 31-19. Mandatory Credit: Chris Humphreys-US PRESSWIRE
The four-time MVP coming off four neck surgeries completed 19 of 26 passes for 253 yards and two touchdowns.
He got a big assist from another free agent, cornerback Tracy Porter, whose 43-yard interception return of Ben Roethlisberger's pass with 2 minutes left sealed the win.
Manning, jettisoned by the Indianapolis Colts in March after missing all of last season with a nerve injury that weakened his throwing arm, hit Demaryius Thomas with a 71-yard touchdown toss for his first score as a Bronco. It was his 400th career TD toss.
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