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': Who Should Replace Anna Kournikova?

Anna Kournikova Biggest Loser 052311 12.JPG Orig Pix Taken 2005 in Florida MIAMI BEACH, FL - MAY 23: (Radar) It looks like 'The Biggest Loser' might have found another new trainer. According

Anna Kournikova Joins 'Biggest Loser': See Her Winning Figure Over the Years [PHOTOS]

Balls to the wall! Tennis champ Anna Kournikova puts the Biggest Losers through their paces

Anna Kournikova leaving 'The Biggest Loser' after one season – New York Daily News

Anna Kournikova at The Biggest Loser (S12E02)

Kournikova opens up about career-ruining back injury - Rediff.com

See The Biggest Loser Contestant's Before and Afters

Yes, Anna Kournikova can relate - Los Angeles Times