WATCH: Human fish Michael Phelps wins 19th gold medal to jump above Argentina in all-time medal table

At this rate Michael Phelps is going to have to move into Fort Knox.

The American swimming phenomenon last night won his 19th (NINETEENTH) gold medal as the United States fought back to claim the 4x100 metres freestyle relay. Swimming the second leg, the 31-year-old performed a magnificent turn to take the lead from France. Ryan Held and Nathan Adrian fought off the French and Australians to make history in Rio. https://twitter.com/Curtos07/status/762485102693617664 Astonishingly Phelps has now overtaken Argentina in the all-time gold medal table - one man out-performing the third largest country in South America. https://twitter.com/TheKnowledge/status/762527643464036352 https://twitter.com/TheKnowledge/status/762531673724641281 Phelps won six golds in Athens, eight in Beijing and retired after winning a further four in London four years ago. However, in 2014 he announced his return to the sport, a return that was last night vindicated. "It felt good to get, after my last 400 free relay of my career, this thing around my neck,” he said afterwards, as he touched the gold medal around his neck, like someone who doesn't have another 18 of them at home. "It feels good to get it back." Here's some of the countries the 31-year-old has won more medals than, (the full, very long, list is here).

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