Maria Sakkari is having a great week in Charleston. The No. 15 seed knocked out defending champion Kiki Bertens, 7-6 (8), 6-3. The Greek took part in Tennis Channel's Confessional Cart to share more about herself. 

Her superstition is pretty normal as she just asks for three balls before she serves. Her least favorite opponent is Petra Kvitova, who just beat her in Miami. The 23-year-old also admitted she's a coffee addict. 

The world No. 50's athletic game is translating really well to the clay at the Volvo Car Open: 

And her perfect bun has picked up plenty of attention:

She gave all her hair secrets after her round of 16 win over Bertens:

It turns out it's not that hard:

She'll take on fifth seed Caroline Wozniacki in the quarterfinals. She's seeking her first semifinal appearance since Seoul in September.