[3] In 2013, she made her debut at The Proms in London's Royal Albert Hall, singing arias by Verdi and Tchaikovsky, with the City of Birmingham Symphony Orchestra.

[3] On 5 April 2014, with just five and a half hours' notice, Opolais substituted as Mimì in Puccini's La bohème in the Metropolitan Opera's matinee performance.

She had not fallen asleep until about 5am, but was woken by a 7:30am phone call asking her to sing again at the 1pm matinee, which was being broadcast around the world as part of the Met's Live in HD series.

The New York Observer noted her "soaring voice and penetrating theatrical presence", and that "she is the most compelling Met Cio-Cio-San since Diana Soviero last sang the role here nearly 20 years ago.

"[5] Opolais performed the title role in Puccini's Manon Lescaut at Covent Garden in the 2013/14 season[6] and also at the New York Met in February and March 2016.