David Muir debuts as ABC 'World News' anchor, replacing Diane Sawyer

September 2, 2014 3:28 PM

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David Muir made his debut as anchor of ABC's "World News Tonight" Monday evening, succeeding Diane Sawyer who signed off last week after five years on the job.

Muir's unveiling, on a Labor Day evening when many viewers were still making their way home from the holiday weekend, was a decidedly low-key event.

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