Joselyn Rivera + Sylvia Yacoub Have a Diva-Off to ‘Best Thing I Never Had’ on ‘The Voice’Joselyn Rivera + Sylvia Yacoub Have a Diva-Off to ‘Best Thing I Never Had’ on ‘The Voice’Closing the night on 'The Voice' were Team Christina kids Joselyn Rivera and Sylvia Yacoub.Alexandra CapotortoAlexandra Capotorto