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Team USA swimmer Katie Grimes should be on your radar. The 15-year-old distance freestyle swimmer placed second (8:17.05) behind US teammate Katie Ledecky in her Olympic debut. Ledecky nabbed first (8:15.67), in their 800m freestyle heat on Thursday. Ledecky and Grimes, dubbed “Katie squared” by Ledecky, both advanced to the Women’s 800m Freestyle Final on...