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In page Bruno Sammartino:

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Sammartino also challenged NWA World Heavyweight Champion Lou Thesz twice for the championship in Canada. One match ended in a draw and the other with Thesz scoring a fluke pin after a collision, despite Sammartino controlling the 20 minute match from the beginning. This match was booked by NWA promoter Sam Muchnick as a preliminary to the forming of the WWWF, to ensure the dominance of the senior organization and its championship.[7]