Italy stunned Team USA with an 8-6 victory in World Baseball Classic pool play Tuesday night, one of the biggest upsets in the tournament's 20-year history that puts the Americans in jeopardy of not advancing to the knockout round.

A team mostly comprised of American major leaguers with Italian heritage, Italy nevertheless entered the game against the powerful, pedigreed U.S. team as distinct underdogs. That changed in the early innings, with three home runs and 4⅔ shutout innings from veteran right-hander Michael Lorenzen staking Italy an 8-0 lead it never relinquished.