Carlos Alcaraz ha vinto Wimbledon

Nonostante + congiuntivo = frase concessiva
Nonostante + subjunctive = concessive clause

“Nonostante sia il numero uno della classifica mondiale ATP”
(Despite being ranked number one in the ATP world ranking)

The conjunction “nonostante” introduces a concessive clause, indicating that there is a contrast or concession between the two parts of the sentence.

In Italian, concessive clauses introduced by some conjunctions of “contrast“, must be followed by subjunctive mood:

• nonostante + subjunctive
• sebbene + subjunctive
• benché + subjunctive
• malgrado + subjunctive

For example:

• Sebbene piova, uscirò per una passeggiata. (Although it’s raining, I will go out for a walk.)
• “Benché piovesse, siamo usciti lo stesso. (Even though it was raining, we went out.) 
• Esco nonostante sia stanco. (I go out even though I’m tired.)
• Vorrei mangiare malgrado non abbia fame. (I’d like to eat even though I’m not hungry.)

Attention: all these conjunctions can introduce a verb, but only “nonostante-malgrado” can be used with nouns:

→ NONOSTANTE – MALGRADO + NOUN or VERB
→ BENCHÉ – SEBBENE + VERB

• Nonostante/Malgrado la pioggia (n.), sono uscito. (Despite the rain, I went out)

But:

• Sebbene/Benché piovesse (v.), sono uscito. (Despite it was raining, I went out)