This Aug. 11, 2018, file photo shows U.S. swimmer Caeleb Dressel competing on his way to winning the men's 100m butterfly final during the Pan Pacific swimming championships in Tokyo.  In the post-Michael Phelps world, Dressel fits snugly into the successor's slot. Coming off two dynamic performances at the world swimming championships, Dressel figures to be one of the biggest stars at the 2020 Tokyo Games.  Yet he is reticent to step into the spotlight. (AP Photo/Koji Sasahara, File) **FILE**
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