Love Her! Naomi Osaka on why winning the Australian Open felt 'really special' [VIDEO]

Article By Katie Kindelan // Sports // GMA

She’s sweet and soft-spoken off the court, but fierce and dominant on the court. Two-time Grand Slam champion and Australian Open winner Naomi Osaka has now had two of what she calls the "happiest moments" of her life.

"It felt really special," she said Wednesday on "Good Morning America" of her Australian Open victory. "I think, well, everyone, if they win a Grand Slam, it feels like one of the happiest moments of their life."

Osaka edged Petra Kvitova 7-6 (2), 5-7, 6-4 on Saturday to win the Australian Open, her second consecutive Grand Slam title.

With the victory, Osaka rose to No. 1 in the rankings.

Though Osaka is now at the very top of her sport, she is still a 21-year-old who got tough love from her mom, Tamaki, after the Australian Open.

"My mom, she was upset at me and she kind of yelled at me to go to sleep," Osaka said. "I think that was the most important thing for her."

Osaka's sister, Mari, was so excited that she said things "I don't think I should repeat here," Osaka said.

"For me, she is like my biggest supporter in a way because we always check each other's matches and we tend to give each other therapy when we lose," Osaka said of Mari, who is also a professional tennis player.