No. Every World Series team with a 3-0 lead has gone on to win the world championship.
The Boston AL team won the very first World Series, in 1903, besting the Pittsburgh Pirates, five games to three.
No. Since the first World Series in 1903, no team has ever won a world championship after losing the first three games of the Fall Classic.
That has never happened in history.
The first team to play in consecutive World Series was the 1906 and 1907 Chicago Cubs.The first team to win consecutive World Series was the 1907 and 1908 Chicago Cubs.
The New York Yankees were the first team to win 10 world series championships.
No team has ever come back from a 3-0 deficit to win the World Series.
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It has never happened in the 100-plus years of World Series competition.
20 times http://www.baseball-almanac.com/ws/wssweeps.shtml The above link indicates World Series won 4 games to none. However, it also show 2 ties in the 1907 and 1922 World Series, so those were technically 5-game series, not 4.
No team has ever lost a World Series after taking a 3-0 lead.
They were the 1st team to win back to back World Series, or for that matter, they were the 1st team to win the World Series twice (1907-1908)