Riding in Tennis Channel's Confessional Cart, Petra Martic had a few secrets to share, like her late-night snacking habits.

The Croatian just reached the semifinals in Charleston, with an upset of Dubai champion Belinda Bencic, and her ranking is up to No. 40.

She shares that her dream job as a child was to be a school teacher to "be in control" and that her late-night snack is peanut butter and Nutella on bread.

"Yeah I know, it's bad," she said. "Don't tell my coach." 

The Volvo Car Open was her first semifinal appearance since winning the WTA 125K Series in Chicago last September.