Two big races on the docket for Michael Phelps on Day 4, including the 200-meter butterfly and the 4x200-meter freestyle relay.
Sitting on 17 Olympic medals, Michael Phelps needed two podium finishes to become the most decorated Olympian all-time, trying to surpass Larisa Latynina of the Soviet Union (18).
It's the fourth Olympics for Michael Phelps, who began his quest at the 2000 Sydney Olympics at just 15 years old.
He entered 2012 after declaring London would be his final Games, also knowing that he needed just three medals to surpass Latynina.
So, how did Phelps fare on Day 4? And, what's in store for his encore?
Two-time Olympic gold medalist Mel Stewart is here with the answer.
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