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I am afraid I must be missing the point. The title mentions "Top Performing Email Report" and the post focuses on duplicates.
Marketo does not send the same email twice to the same lead in a single flow execution, even though the lead may have, say, one record from a list import and one duplicate creted by Salesforce.
There are three valuable articles highlighting the best practces to work with duplicates:Working with Duplicate LeadsGet Alerts for New Duplicate LeadsFind and Merge Duplicate Leads