The Ravens tied the score 16-16 with 2:02 remaining on a Joe Flacco touchdown toss to Dallas Clark but the Steelers got a quick start on the ensuing drive when Emmanuel Sanders returned the kickoff 44 yards.
Suisham's decisive kick made him 14-for-14 on field goal tries this season as Pittsburgh (2-4) recorded a second straight win.
Flacco finished 24-of-34 through the air for 215 yards for the Ravens (3-4), who fell for the third time in four contests.
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