Halloween came early Down Under for Daria Gavrilova. The Russian-turned-Australian pulled off the perfect Helga and her friend took on Arnold from the popular 1990s Nickelodeon cartoon Hey Arnold!. Gavrilova's attention to detail was spotless, as she even had a unibrow.

The 25-year-old has had a rough year on court, and revealed in September that she's dealing with foot problems.

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Her ranking has dropped from No. 35 to No. 237, and she hasn't played since losing in the first round of the US Open. She did win a doubles crown this year in Strasbourg with Ellen Perez.