It's: 1) Acest bărbat; 2) bărbatul acesta; or 3) bărbatul ăsta

just when I thought I'd 'got the rule' and thought the pronouns in the table are for before the noun the others are for after I've got it wrong again and thought 'acesta' is the connection for the difference to do with definite indefinite nouns, word position? when does one use acesta with a masculine singular noun? would it be after the definite article noun? Thanks