Visitors arrive : Olgaâ s fiancÃ e Lensky who is a young poet , and his friend Eugene Onegin . Visitors arrive : Olga 's fiancÃ Lensky ( tenor ) , a young 18 year-old poet , and his friend Eugene Onegin ( baritone ) , a 26 year-old world-weary St Petersburg ` drawing-room automaton ' ( Nabokov ) . Lensky introduces Onegin to the Larin family .