Jessica Sanchez: 'My All'

For Jessica Sanchez, Jennifer Lopez says, "I knew I wanted to hear her sing a song like this; it's one of my favorite songs. ... There's a tenderness in this song that I feel that she will kill. ... I think it's going to be a really nice moment for her."

She has sung Whitney Houston and Beyoncé successfully already, so Mariah Carey's My All shouldn't be any problem, right? Doesn't look that way....