The NWA United National Heavyweight Championship (often shortened to UN Championship) is a professional wrestling title in the Japanese promotion Pro Wrestling Zero1. It is one of Zero1's top two singles titles, along with the Zero1 World Heavyweight Championship. The UN title was created on January 31, 2004, when Masato Tanaka defeated Steve Corino in an Indian strap match, wrestling as Masa Tanaka. It was founded at a time when Zero1 was a member of the National Wrestling Alliance; since the two organizations' parting in late 2004, the NWA does not recognize or sanction it, though it retains the NWA initials. There have been a total of 22 recognized champions who have had a combined 26 official reigns. The title was revived by NWA Pro Wrestling in January 2011. NWA began recognizing titl