As Desdemona in Verdi's OTELLO:

Tanner & Lopez soar .... Lopez's opening in her bed chamber in act four was filled with emotion and allowed for the full beauty of her voice to waft out amongst the audience and ultimately shock the crowd with her dramatic farewell to her pal Emilia.
- Creative Loafing - May 7, 2010

Lopez was excellent too, reminding me of a young Ruth Ann Swenson. Tanner and Lopez, who, let me say it one more time, were exceptional in these roles. Desdemona, who can often come across as window dressing, was very sympathetically portrayed by Lopez in this production, especially in the final act's "Willow Song" and "Ave Maria." I'd readily see both of these singers again with enthusiasm.
- A Beast in a Jungle, May 7, 2010

But the way Sandra Lopez sang that “Ave Maria” – and the plaintive “Willow Song” that led into it – painted a picture of its own. Lopez’s voice combined the plaintive edge of the woodwinds, her companions in much of the “Willow Song,” with the throbbing intensity that comes only from the human throat.
- the Charlotte Observer, May 7, 2010

Micaela, CARMEN

"Soprano Sandra Lopez portrayed selfless, blue-skirted Micaela beautifully, her silvery voice and keen, earnest demeanor linking Don Jose to the goodness and innocence he has regretfully left behind." - Music in Cincinnati.com

"The evening’s most moving portrayal came from Sandra Lopez as the peasant girl Micaela. As an actress, she communicated with ease. Her beautifully felt air, “Je dis que rien ne m’epouvante,” sung against the horns of the Cincinnati Symphony Orchestra, was irresistible." - The Cincinnati Enquirer, July 23, 2009: Janelle Gelfand

“Micaela usually comes off as a bland goody two-shoes. But Sandra Lopez makes her more girlish, with a gleaming soprano that fills the house.” - Dallas Morning News & Fort Worth Star Telegram

“Sandra Lopez brought an opulent lyric soprano to the role of Micaela. Her fervor and theatrical temperament brought this often tepid character to vivid operatic life. Lopez’s lyrically soaring performance of Micaela’s third act aria received the ovation of the evening.” - The Miami Herald

“…the voice is striking, with Puccinian thrust and metal.” - Opera News Online

“Sandra Lopez as Michaela, is a gorgeous young woman who has a nice strong voice and sang the role with ease.” - San Antonio Current Online

"Soprano Sandra Lopez was a splendid Micaela, especially in Act III, when she gave glimpses of a thrilling high end." - incidentlight

“The other standout among the leading singers was Sandra Lopez as Micaela. A University of Miami graduate, Metropolitan Opera National Council Auditions winner, and graduate of the Met’s Lindemann Young Artists Training Program, Lopez is much more than a hometown heroine. Her shining lyric soprano glowed iridescently in Micaela’s third act aria. Indeed she was the only artist who received an ovation that stopped the show on opening night. Not content to play Micaela in the usual weak, ill defined manner, Lopez made her a true rival to Carmen (for the affection of Don Jose).” - Internet Music News

“As Micaela, the rejected good girl, Sandra Lopez brought a secure technique and affecting innocence to the character, singing with precision and sensitivity”. - The Sun-Sentinel

“Aplauso especial para Sandra López, muy convincente en su Micaela, y que logró largos aplausos con su Tu vois que rien ne m'epouvante.” - El Nuevo Herald

“As Micaela, the country girl who is no match for the gypsy, Sandra López basically sang her two arias as a guest star in recital — in truth it could be said the role was written this way — with a luscious, stronger voice than one often expects.” - New Times

“La soprano Sandra López es de las mejores voces del elenco. Le dio vida al personaje Micaela, …en que lució con esplendidez su timbre y amplitud vocal.” - El Diario de las Americas.

Cio Cio San, MADAMA BUTTERFLY

“Soprano Sandra Lopez has everything it takes to become a memorable Butterfly. She's a committed, passionate actress with a luscious and tireless voice she can suffuse with emotion.” - Boston Globe

“Sandra Lopez brought to her first Cio-Cio San a luminous soprano, gorgeously even from top to bottom, also displaying courage, as did her colleagues, in negotiating the treacherous aisle steps as she made a graceful entrance from the rear of the theater moving slowly toward the stage. Her compelling "Un bel di" opened the soul of a woman still hopeful of recapturing her dream of life.” - Berkshire Eagle

“Sandra Lopez is a persuasive Cio-Cio San with a gorgeous and varied soprano voice that does full justice to the always thrilling ‘Un bel di’.” - Curtain Up

“The voice of soprano Sandra Lopez seemed ideally suited to the demanding role. For her arrival in Act 1, she proceeded alone down the main aisle of the house, her voice flowing as freely as her orange-and-crimson gown. The famous aria "Un bel di" that opens Act 2 was dead-on.” - Times Union

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