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The prior record was set last September by Jakob Ingebrigsten of Norway at 1:52.60.
The mark was a huge improvement for Miller, who set his prior best at 1:53.64 in the prelim round on Monday. According to the AAU, the win marks his seventh national title and eighth meet record -- but, his first world record.
There may already be another athlete gunning to take down Miller's mark in five years.
Jonathan Simms of Plano, Texas broke Miller's nine-year-old age group meet record in the 800m today with a time of 2:19.43. Miller ran 2:25.43 in 2011. Simms also won the 400m in 59.25.
For Milesplit's full coverage of the AAU Junior Olympics click HERE