The 2006 American League Championship Series (ALCS), the second round of the 2006 American League playoffs, began on October 10 and ended on October 14. The wild card Detroit Tigers swept the West Division champion Oakland Athletics 4 games to none to advance to the 2006 World Series, and became the fourth AL team to win 10 pennants, joining the New York Yankees (39), the Athletics (15), and the Boston Red Sox (11). Magglio Ordóñez's game-winning walk-off home run in the bottom of the 9th inning of Game 4 sealed the pennant for the Tigers. This ALCS marked the 5th different AL pennant winner in as many years (following 2005 with the White Sox, 2004 with the Red Sox, 2003 with the Yankees, and 2002 with the Angels).

The Athletics defeated the Minnesota Twins 3 games to none in the AL Division Series, and the Tigers defeated the Yankees 3 games to 1. The Tigers faced the National League champions St. Louis Cardinals in the World Series, but lost in five games. The Athletics had home-field advantage (despite the Tigers having a better regular season record) as the wild card team defers home field advantage in the LCS regardless of regular season record.

2006 American League Championship Series

The Athletics were seeking their first AL pennant since 1990, while the Tigers captured the league title for the first time since their win in the 1984 World Series. The series was a rematch of the 1972 American League Championship Series (then a best-of-five series), in which Oakland defeated Detroit in 5 games. Detroit manager Jim Leyland, who led the Florida Marlins to the 1997 World Series title, became the seventh manager in history to win pennants in both leagues. It was the second consecutive ALCS without the Yankees and Red Sox.

2006 American League Championship Series

Summary

Oakland Athletics vs. Detroit Tigers

Game summaries

Game 1

Tuesday, October 10, 2006 at McAfee Coliseum in Oakland, California

Oakland was 0-for-13 with runners in scoring position, while Detroit turned four double plays (both are LCS records). Tigers first baseman Sean Casey left the game in the bottom of the sixth inning due to an apparent leg injury. Brandon Inge homered with two outs in the third off Barry Zito, who allowed a double and two walks to load the bases before Magglio Ordóñez's single scored another run. Next inning, Iván Rodríguez hit a leadoff home run off Zito, who then walked Craig Monroe. Marcus Thames then hit into a forceout, advancing to second on D'Angelo Jiménez's error and scoring on Inge's double. Inge moved to third on Curtis Granderson's groundout, then scored on Plácido Polanco's single. Oakland avoided a shutout when Milton Bradley doubled to lead off the eighth off Joel Zumaya, moved to third on Frank Thomas's groundout, and scored on Jay Payton's groundout.

2006 American League Championship Series

Game 2

Wednesday, October 11, 2006 at McAfee Coliseum in Oakland, California

Oakland struck first in Game 2 when Mark Kotsay doubled in the first with one out off Justin Verlander, moved to third on a wild pitch, and scored on Milton Bradley's single, but Detroit tied it when Carlos Guillén doubled to lead off the second off Esteban Loaiza, moved to third on a groundout, and scored on Craig Monroe's sacrifice fly. In the third, Kotsay doubled with two outs off Verlander before Bradley homered to put Oakland up 3-1. In the fourth, Detroit loaded the bases on two singles and a walk with one out off Loaiza before Monroe's single scored a run, Alexis Gomez's 2-run single gave Detroit the lead, and Brandon Inge's sacrifice fly put the Tigers up 5-3. In the sixth, Monroe doubled off Loaiza with two outs before Gomez homered to put Detroit up 7-3. Eric Chavez's leadoff home run off Verlander in the bottom of the inning cut the lead to 7-4. Next inning, Bradley homered with two outs off Wilfredo Ledezma to make it 7-5 Detroit, but the Tigers got that run back in the ninth on Granderson's leadoff home run off Huston Street. In the bottom of the inning, Oakland got three straight two-out singles off Todd Jones to load the bases, but Frank Thomas flew out to center to end the game. Since the ALCS has been increased to a seven-game series, no team has come back to win the series after losing the first two games at home.