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Rio Olympics 2016: We'll never see another Michael Phelps, says coach after swimmer's swansong
'What if' says medal-hungry Michael Phelps ahead of Rio Olympics swansong
Rio 2016: Michael Phelps backs out of 200m freestyle ahead of US Olympic trials
The five most memorable Michael Phelps moments
Is Michael Phelps making a return to competitive swimming?
Phelps retired after winning four gold and two silver medals at the 2012 London Olympics to take his career tally to 22, 18 of which were gold.
