A flock of women triumphed on opening night of Peter Martins' patchy Swan Lake at New York City Ballet: the peerless Sara Mearns as Odette-Odile; Ana Sophia Scheller, Tiler Peck and Megan Fairchild in a spectacular pas de quatre; and corps dancers Jacqueline Bologna, Baily Jones, Alexa Maxwell and Claire Von Enck as the Four Little Swans.