Rio 2016 Olympics: Day 4 as it happened

Serena Williams knocked out of Rio Olympics
Serena Williams knocked out of Rio Olympics

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    Serena Williams knocked out of Rio Olympics

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Serena Williams knocked out of Rio Olympics 00:55

(CNN)Day four at Rio 2016 was another golden bonanza for swimming superstar Michael Phelps, who added two more titles to his record career tally.

Hungary's "Iron Lady" Katinka Hosszu continued her fine form in the pool, notching her third gold medal, while American Katy Ledecky bagged her second of the Games.
Tuesday's headlines:
    Recap all the action below and go here for our full Rio 2016 coverage.