Nadine Sierra was the big winner on the opening night of Manon. Her voice is at its best, splendid. The high notes are easy, well timbred, and brilliant. The dynamic control is of great quality and the projection of the singing, without being magnificent, is fully satisfactory. The exhaustive technical control of breathing and emission allows her to sing naturally and with and ease, without apparent physical effort and without dropping in performance over the course of a show lasting...