Naomi Osaka beat her tennis idol Serena Williams on Saturday in a much talked about U.S. Open match.

The 20-year old defeated Williams 6-2, 6-4, becoming the first Japanese person to ever win a Grand Slam title, per Yahoo Sports.

Osaka grew up admiring Williams and her father, Leonard, studied how Venus and Serena Williams’ father, Richard, trained his daughters and applied that training to Osaka.

“It was always my dream to play Serena in the U.S. Open finals, so I’m really glad I was able to do that,” an emotional Osaka said on Saturday.

Osaka was born in Japan and plays for the country, but she also has roots in the U.S.

She started playing tennis after she moved to New York when she was three years old. Her mother is Japanese and her father is Haitian, and she lived with her Haitian grandparents when she moved to the U.S.

She moved to Florida to continue her tennis training when she was eight, according to Yahoo Sports.

Her U.S. Open victory placed Osaka as the seventh in the world on the Women’s Tennis Association ranking on Monday.