Italy defeated Iran in straight sets (25-19, 25-23, 25-21) in Osaka, Japan.
Ivan Zaytsev led Italian team with 27 points, while Mohammad Mousavi was Irans best scorer with 13 points.
Iran has been scheduled to face USA on Thursday.
Slobodan Kovacs men have already lost to Argentina, Poland and Russia in the competition.
The tournament is a qualification process for the 2016 Summer Olympics in Rio de Janeiro, Brazil.
The top two teams will qualify for the Olympics and join Brazil as it has already secured a berth as the host country.
The 2015 FIVB Volleyball Mens World Cup began on September 8 in Japan and will finish on September 23.
By Tasnim News Agency
