Maria Sharapova has only been retired from tennis ... Sharapova appeared as a guest judge on the business reality show Shark Tank, on the episode that aired on Friday, and she showed herself ...

This week, fitness and candy are joining forces with fitness accessories company Bala celebrating its partnership with Maria Sharapova. Bala, which was featured on "Shark Tank" earlier this year ...

with Maria Sharapova filling her seat. Robert Herjavec also missed this episode, limiting total Shark participation to five. The absence of both regular sharks changed standard tank dynamics.

The former First Lady of California tells PEOPLE that her product was inspired by her continual work with Alzheimer's advocacy following the death of her father Maria ... on Shark Tank on Friday ...