Has any two teams in the World Series ever get there without losing a game during the postseason?

Question

Related: Has there been a time the 2 NBA or NHL teams in the playoffs final series got there without losing any games?

MLB Postseason Format Timeline:

• Before 1969, the team with the best record from the AL and the team with the best record from the NL during the regular season played in the World Series.
• Between 1969 and 1993, there was one playoff round before the World Series (AL/NLCS).
• Between 1995 and 2011, there were two playoff rounds before the World Series (AL/NLDS, AL/NLCS).
• Since 2012, there has been a play-in game for Wild Card teams, adding an additional game to the format for Wild Card teams.

Has any two teams in the World Series ever get there without losing a game during the postseason?

Answer 1

Has any two teams in the World Series ever get there without losing a game during the postseason?

Yes. However, all these instances took place during the "one playoff round before the World Series" format between 1969 and 1993. Each of these teams went 3-0 before reaching the World Series.

• 1969 - Mets vs. Orioles
• 1970 - Orioles vs. Reds
• 1975 - Reds vs. Red Sox

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Between 1969 and 1993, 14 teams reached the World Series without losing a game. Since 1995, two teams have reached the World Series without losing a game:

• 2007 Rockies (3-0 NLDS, 4-0 NLCS)
• 2014 Royals (1 Wild Card play-in win, 3-0 ALDS, 4-0 ALCS)

The Royals were the first team in history to win their first eight playoff games₍₁₎. The Rockies, along with the Reds in 1976, won their first seven playoff games₍₂₎. Given the format at the time, seven consecutive playoff wins gave the Reds an undefeated postseason.