Two of opera’s greatest stars come together to portray the pain of unrequited love in Tchaikovsky’s poetic drama. Soprano Renée Fleming is musically and dramatically radiant as the shy Tatiana, who falls in love with the worldly Onegin, played with devastating charisma by baritone Dmitri Hvorostovsky. Valery Gergiev conducts an understated yet utterly evocative staging by Robert Carsen.