The US National Swimming Championships opened, the first for the sport without the legendary Michael Phelps since 1998.
Nathan Adrian prepares for the men's 100m freestyle finals on day one of the National Championships on June 25, 2013. The Olympic men's 100m freestyle champ, repeated as the national champion in that event by finishing in 48.10.
Phelps, the winner of six medals (four gold, two silver) at the 2012 London Games, retired last year as the most decorated Olympian of all-time.
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