Answer: ALCS

AnswerCrossword Clue
ALCSAngels' last stop in '05
ALCSOct. pennant race
ALCSL.A. lost it to Chi. in 2005
ALCSOctober baseball letters since 1969
ALCSPart of baseball's postseason: Abbr.
ALCSThe N.Y. Yankees won it six times from 1996 to 2003
ALCSWorld Series precursor
ALCSPart of the MLB postseason
ALCSWorld Series prelude: Abbr.
ALCSPart of the MLB post-season
ALCSWorld Series lead-in: Abbr.
ALCSMLB pennant race
ALCSOct. baseball semifinal
ALCSMLB postseason semifinal
ALCSMLB best-of-seven series
ALCSWorld Series qualifier: Abbr.
ALCSOct. contest whose winner goes to the World Series
ALCSBaseball semifinals, for short
ALCSA "Fall Classic" prelude (abbr.)
ALCSBig games for the Yanks or Sox, perhaps
ALCSBaseball postseason letters
ALCSBaseball postseason semifinal, briefly