(Photo by Ryan Pierse/Getty Images)

Athing Mu is an Olympic champion.

The 19-year-old American phenom won the 800 meter final in her first-ever Olympics, crossing the line in 1:55.21 to break the American record.

Leading for the entire race, Mu finished ahead of Keely Hodgkinson of Great Britain, who ran 1:55.88 to place second, and American Raevyn Rogers, who finished in 1:56.81 to round out the top three.

With the Olympic victory, Mu joined Madeline Manning-Mims as the only two American women to win Olympic gold in the 800 meters. Manning-Mims accomplished the feat 53 years ago at the 1968 Mexico City Olympics.

Mu’s Olympic win is the crowning achievement in what was a record-smashing track and field season for the New Jersey native. She made it clear why she was the favorite to win the event going into the Games.

Since turning pro at the U.S. Olympic trials and winning the 800 meters to punch her ticket to Tokyo, Mu has gone on to stay unbeaten in all of the event rounds leading up to the final.

The youngster is only the second American to take home a gold medal in track and field thus far in Tokyo. Valarie Allman won a gold medal in the women’s discus on Monday.