In this video, Idina Menzel says "My friend, Sayaka."
She gives emphasis to the YA which seems to be similar to this review of the anime School Days wherein the reviewer says "MaKOto" and "KaTSUra".
So, what is the correct pronunciation of "Sayaka" ? Google Translate gives 2 different pronunciations. The Japanese one is the one I'm thinking and the American one is the one Idina said.