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ALDS: 3-0 over Boston Red Sox
ALCS: 4-1 over Anaheim Angels
World Series: 4-0 over Houston Astros
Since the playoffs expanded to a three-series format in 1995, no team has yet gone 11-0 to win the World Series. In fact, the 2007 Colorado Rockies are the only team to have entered the World Series with a perfect 7-0 postseason record, and they promptly got swept by the aforementioned Red Sox.
Though a flawless October hasn't happened, the 2005 White Sox were one of the two teams to have gotten the necessary 11 wins in a span of only 12 games.
In nine of those 12 games, they scored at least five runs. In 10 of the games, they allowed four or fewer runs to score. In total, they outscored their opponents 67-34, hitting 18 home runs and finishing each series with a team ERA of 3.00 or less.
Oddly enough, it was the series in which they lost a game that their domination was most clearly on display.
Complete games by pitchers aren't anywhere near as prevalent as they used to be. In 1978 there were 2,102 games played and 1,034 complete games. In other words, roughly one out of every two games featured a pitcher going the distance.
By 2005, there were only 189 complete games in the 2,430 games played for a ratio of nearly one complete game for every 13 games played. As an entire team, the White Sox had just nine complete games during the regular season.
You wouldn't know it from Ozzie Guillen's extremely conservative use of his bullpen against the Angels.
Jose Contreras lasted 8.1 innings in Game 1 before Neal Cotts took over in the 9th inning of Chicago's sole loss in the 2005 playoffs. It was the last time in the series that a relief pitcher entered the game for Chicago, though, because Mark Buehrle, Jon Garland, Freddy Garcia and Contreras each had a complete game victory in Games 2 through 5.