The Biggest Loser: Anna Kournikova Out

Although the former tennis pro "was not fired," the reality show "wasn't the right fit for her," a source tells PEOPLE

The Biggest Loser - Rotten Tomatoes

Anna Kournikova is leaving The Biggest Loser after just one season

Mark your calendar: Season 12 of The Biggest Loser premieres Sept 20!

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Anna kournikova tennis star hi-res stock photography and images - Page 3 - Alamy

Anna Wright, The Biggest Loser Wiki

Anna Kournikova Will Replace Jillian Michaels on 'The Biggest Loser' (2011/05/25)- Tickets to Movies in Theaters, Broadway Shows, London Theatre & More

Anna Kournikova to replace Jillian Michaels on the Biggest Loser. I'll definitely be watching. : r/Fitness

Anna Kournikova to Offer Losing Lessons on 'The Biggest Loser'

Anna Kournikova To Appear In 'The Biggest Loser

Anna Kournikova Exiting 'Biggest Loser' After One Season