Michael Phelps produced a vintage performance to claim an astonishing 19th Olympic gold medal of his career on Sunday.
The 31-year-old, who quit the sport after the 2012 Games, was back with a bang in Rio as Team USA eased to victory in the 4x100 meters freestyle relay.
Phelps, who produced a stunning second leg, has now won 23 medals in total, extending his record as the most decorated Olympian of all time.
With son Boomer in attendance, Phelps did his kid proud, along with teammates Caleb Dressel, Ryan Held and Nathan Adrian.
It was the second gold of the night for the U.S. after Katie Ledecky produced an astonishing performance to win gold in the 400m freestyle.
The 19-year-old smashed her own world record to win in a time of 3:56.46 -- nearly five seconds ahead of her closest rival.
Ledecky's previous best in the 400m was in August 2014, when she came home in 3:58.37 at the Pan Pacific Championships.
But she tore that time to pieces to finish ahead of Britain's Jazz Carlin and U.S. teammate Leah Smith.
A day after anchoring the U.S 4x100m relay team to silver, Ledecky showed just why she's being touted as the best female swimmer on the planet.
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