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UPDATED | August 10, 2016 12:30am

Michael Phelps now has 25 medals in all — and three more races in Rio to add to his almost unimaginable total.

On a golden night at the pool on Tuesday, Phelps earns the 20th and 21st Olympic gold medals of his staggering career.

He won the 200-meter butterfly and came back about an hour later to anchor the United States to victory in the 4×200 freestyle relay.

Phelps has four other medals — two silver and two bronze.

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Michael Phelps has claimed the 21st gold medal of his career, anchoring the United States to a dominating victory in the 4×200-meter freestyle relay.

About an hour after winning gold medal No. 20 in the 200 butterfly, Phelps completed his grueling double with a triumphant four laps of the pool.

The result was no longer in doubt by the time Phelps dove in. Conor Dwyer, Townley Haas and Ryan Lochte made sure of that, handing off a commanding lead to the most decorated athlete in Olympic history.

Phelps essentially spent the next 100 seconds or so on a victory lap, the crowd’s cheers growing louder with each stroke. He touched in 7 minutes, 0.66 seconds, a full body length ahead of Britain’s James Guy.

The British earned silver in 7:03.13, while Japan took the bronze in 7:03.50.

When it was done, Phelps simply sat on the starting block, thoroughly exhausted. He motioned at his neck as though he had nothing left to give.

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