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Buenos días, señor Díaz.

Buenos días, señor Díaz.
Good morning, Mr. Díaz.
From Lesson 5:Formal and informal you (tú vs. usted)·Spanish (Latin America)

Breakdown of Buenos días, señor Díaz.

el señor
Mr. / sir / gentleman
buenos días
good morning

Questions & Answers about Buenos días, señor Díaz.

Why is it buenos (masculine) instead of buenas (feminine) when días ends in an 'a'?
Most Spanish words ending in 'a' are feminine, but día is a very common exception! It is a masculine word, so it must be matched with the masculine adjective buenos.
If I continue talking to Mr. Díaz, should I use tú or usted?
You should use usted. Addressing someone with titles like señor, señora, or señorita along with their last name is a strong signal that you are in a formal situation. It shows respect, so you will want to use the formal usted forms for the rest of the conversation.
Why is señor written with a lowercase 's' here?
In Spanish, titles like señor (Mr.) and señora (Mrs.) are not capitalized when you write out the full word. However, if you use the abbreviation (Sr. or Sra.), you do capitalize the first letter!
Shouldn't there be an el before señor Díaz?
Not in this case, because you are talking directly to him. In Spanish, you only add the definite article el or la before a title (like el señor Díaz) when you are talking about that person to someone else.

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