#1 Lex Luger was United States Champion for 523 days
The Lex Express carried the United States Championship for a whopping 523 days from May 22, 1989, to October 27, 1990. To this day, he is the longest-reigning United States Champion in the history of the championship. The match itself aired on June 10th at NWA World Wide Wrestling with Luger defeating Michael Hayes.
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Luger's reign ended at WCW's Halloween Havoc pay-per-view in 1990. Luger would win the title once again, before embarking on a run as WCW World Heavyweight Champion.
Luger told Sportskeeda in December 2018 about his career:
"I look back at my fifteen-year career with great memories. I worked with probably almost virtually every top performer of my era, and I don't look at what I didn't accomplish."
The legendary Lex Luger's reign remains unmatched and is unlikely to be replicated any time soon. As of this writing, Sheamus has just recently passed one hundred days as United States Champion. Could he be the one to break the record for the longest reign? Time will tell, but for now, the honor belongs to the Lex Express.