But it did not take long for Italy to find the ball at the back of the net , since Locatelli tapped in from close range following a hard-charging jog down the sideline and cross off Domenico Berardi left his teammate with the simplest of finishes.
Switzerland fought to create chances against a stingy Italian shield which had not surrendered a goal above their nine-match winning series as well as the first half finished with the hosts leading 1-0.
Locatelli scored a deserved moment for Italy shortly after the break, picking up a pass on peak of the penalty area and beating a left-footed shot beyond Korean keeper Yann Sommer to generate the people' way back in the game more complex.
Ciro Immobile added additional gloss to the scoreline before full time having an absolute screamer from beyond the playground that defeat Sommer in his far post to give Italy their sixth target in the Euro in 2 games after their 3-0 win over Turkey on Friday.
The result retains Italy, unbeaten in 29 matches following the triumph and also undefeated in competitive matches in the Stadio Olimpico, atop Group A on six factors, together with Wales in minute on four points after beating fourth-place Turkey earlier in the day and Switzerland using one stage in third.
Up for Italy is a Sunday game against Wales, while Switzerland confront Turkey on Precisely the Same day.