Contreras started Game 1 of every series during the playoffs. He won two of the three Game 1's. The one he lost was to the Los Angeles Angels, this allowed Contreras to earn the win in the pennant clinching Game 5, the fourth consecutive complete game for White Sox starting pitching. Contreras went 3–1, with a 3.09 ERA, 14 strikeouts, and only two walks. During Game 1 of the 2005 World Series, television commentators said that Contreras, who started the game for the White Sox, had his name banned from being mentioned in Cuba by order of President Fidel Castro. White Sox games were also banned from Cuban television and could be seen only with illegal television satellites. The White Sox went on to win the World Series in 4 games.