"I am beyond happy because I had to prove that (last year's victory) was not chance, so now I am totally at peace. I love to compete against myself and getting better and better," said Ronnie White, of Fort Worth, Texas.
Fifty mental athletes competed all day in the 13th annual championship in lower Manhattan that included events such as memorizing the names of 99 people and their pictures, a 50-line poem in free verse and over 100 single numbers in the right order.
In the category of speed numbers, computer science student Nelson Dellis, 26, won and topped White's previous record by remembering in five minutes 178 different numbers in their right order.
White, who is able to memorize a deck of cards in 1.5 minutes, will go on to represent the United States at the World Memory Championships in Guangzhou, China in November.
Mostly won by Britons, last year's world championship was clinched by Briton Ben Pridmore, who memorized a randomly shuffled deck of 52 cards in 24 seconds.
Despite their astounding feats, most competitors profess nothing unusual about their prodigious memories, claiming that all it takes is regular mental exercise.