Mengoni ha vinto il 73esimo Festival di Sanremo

Infinito passato
Past infinitive

“…uno dei pochi artisti ad aver vinto due volte il Festival di Sanremo”
(…one of the few artists to have won the Sanremo Music Festival twice)

In this article, the phrase “ad aver vinto” is an example of the Italian infinito passato, which is the equivalent of the English present perfect infinitive. It is a compound verb form that is used to express an action that was completed before another past action, and is often translated to English using the auxiliary verb “have” followed by the past participle of the main verb.

In the specific sentence “Mengoni, con questa vittoria, diventa uno dei pochi artisti ad aver vinto due volte il Festival di Sanremo“, the infinito passato “ad aver vinto” is used to indicate that Mengoni had already won the Festival of Sanremo in the past (with the song “L’essenziale”).

Here’s another example: 

“Sono felice di aver imparato l’italiano” (I am happy to have learned Italian). 

In this case, the infinito passato “aver imparato” indicates that the action of learning Italian was completed before the present moment, and the speaker is expressing satisfaction or a feeling of accomplishment about that action.