United States' Michael Phelps smiles as he arrives for a swimming training session at the 2016 Summer Olympics in Rio de Janeiro, Brazil, on Tuesday.
United States' Michael Phelps smiles as he arrives for a swimming training session at the 2016 Summer Olympics in Rio de Janeiro, Brazil, on Tuesday. Matt Slocum AP
United States' Michael Phelps smiles as he arrives for a swimming training session at the 2016 Summer Olympics in Rio de Janeiro, Brazil, on Tuesday. Matt Slocum AP