Serie A's first season was the 1929/30 season, so it did not exist in the 1917/1918 season. There were other leagues in place prior to then. Due to World War I the main league was not played in the 1917/1918 season, so there was no winner.
There was not an Italian Serie A in 1918 due to World War 1.
The team that won the Italian Serie A in 2003 was Juventus.Juventus won the 2003 Serie A.
The team that won the Italian Serie A in 2012 was Juventus.
The team that won the Italian Serie A in 2002 was Juventus.Juventus were the 2002 Serie A champions.
The team that won the Italian Serie A in 2014 was Juventus.
The team that won the Italian Serie A in 2013 was Juventus.
The team that won the Italian Serie A in 2010 was Inter.
The team that won the Italian Serie A in 2008 was Inter.
The team that won the Italian Serie A in 2006 was Inter.
The team that won the Italian Serie A in 2001 was AS Roma
The team that won the Italian Serie A in 1994 was Inter.
The team that won the Italian Serie A in 1991 was Sampdoria.