Michael Phelps is swimming off into the sunset. In his last Olympic swimming race of his career, Phelps and the United States took home the gold medal in the 400m individual medley, providing a fitting exclamation point to end Phelps' storied Olympic career.

The team, consisting of Phelps, Matt Grevers, Brendan Hansen and Nathan Adrian, won by nearly two seconds over Japan, who took home the silver medal. The United States finished with a time of 3:29.25, while the Japanese finished with a time of 3:31.26. The Australians finished third with a time of 3:31.58 to capture the bronze.

The story though, as expected, is Phelps. With the gold medal, Phelps has now claimed six medals at the London Olympics -- four gold and two silver. Phelps' storied career ends with 22 medals -- 18 of which were gold, including the last one earned today.

The gold medal also keeps the United States' winning streak in tact in the 400m individual relay, as the USA has never lost the event.

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