 " Fighter " has been covered on numerous occasions . On May 23 , 2007 , singer Jordin Sparks covered " Fighter " during the season finale of the sixth season of US singing contest American Idol , which made her the winner . On May 26 , 2010 , five female contestants of the ninth season of American Idol : Lacey Brown , Didi Benami , Katie Stevens , Siobhan Magnus and Crystal Bowersox performed a medley of Aguilera 's hits " Beautiful " and " Fighter " , where Aguilera also performed her 2010 single " You Lost Me " . " Fighter " was also covered by her team 's contestants on the second season of The Voice , where she is one of the coaches as well as one of the performers , on April 16 , 2012 . 
