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SHEFFIELD, England – “I know why I lost,” Anthony Joshua said, and to his right Eddie Hearn, legs crossed, a familiar smirk creasing his face, noticeably flinched. He knows? Hearn has had a handful of conversations with Joshua since Joshua was stopped by Andy Ruiz last June, the biggest heavyweight upset since Buster Douglas knocked out Mike Tyson—and one of the bigger upsets in boxing, period. The morning after, Hearn popped into Joshua’s rented townhouse in downtown Manhattan. Joshua asked Hearn to join him on the patio. F--k, that happened, Joshua told Hearn.