Hamilton made a place up to seventh, and slotted in behind his team-mate George Russell as both Mercedes drivers look to get into the top five.
Max Verstappen had cruised ahead of his rivals by the end of lap one
A seamless start in Imola
Before the lights went out, Verstappen appeared crooked on the grid, but his start was legal, the champion eking out every possible advantage to claim the lead at the first chicane.
Despite being hit with a three-place grid penalty, Oscar Piastri was determined to remain with the leading pack, clinging on to the Ferrari, and keeping his rivals behind.
As the drivers crossed the line to end the first lap, the top three comprised of Verstappen, Lando Norris and Charles Leclerc.