Yes, opposite Laurence Guittard, who (as you probably know) had played Don Quixote (Cervantes) at matinees for five months during the original Broadway run. He also played Dr. Carrasco in the original production, and that was for well over a year.
When Diener first went into that 1992 revival, playing Tuesday evenings and Wednesday matinees as the alternate for Sheena Easton, she was interviewed for Newsday. Easton, as you may well recall, had fainted onstage during one performance. Diener was quoted in Newsday thus: ”There've have been some cuts in the rape scene. When I go in, we'll restore those.” She was 62 at the time. She had played Aldonza the previous October in San Diego. The Newsday item started: ”She has had ribs fractured, been dropped eight or nine feet onto her shoulder, had teeth split, cracked and almost knocked out. Joan Diener has done it all for love of 'Man of La Mancha' and she's about to do it again.” Then she took over full time for the last four weeks.
I still kick myself for not getting myself to that revival when she and Guittard were in it together.