Smith caught Flacco's strike and spun away from cornerback Joe Haden as the Ravens (6-2) beat the Browns (2-7) for the 10th consecutive time. It was also Baltimore's 15th straight win following a loss, and helped the Ravens shake off a 30-point loss to Houston two weeks ago.
Baltimore improved to 5-0 after a bye week under coach John Harbaugh, who is 10-0 in his career against Cleveland.
Phil Dawson kicked five field goals for the Browns, who were again competitive but failed to score a touchdown on five trips inside Baltimore's 20-yard line.
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