Detroit took game one of their best-of-five series with Oakland, winning, 3-1, behind the pitching of ace starter, Justin Verlander.
Dating back to 2006, it was Verlander's ninth post-season start, improving his playoff record to 4-3.
Game two is set for Sunday at 12:07 pm EDT at Detroit. The Orioles and Yankees begin their best-of-five divisional series Sunday at 6:07 pm, in Baltimore.
The Cincinnati Reds won their first post-season game since 1995, taking down the Giants, 5-2, in San Francisco.
Brandon Phillips supplied more than enough offense, going 3-for-4 with a two-run homer in the third inning and an insurance RBI single in the ninth.
Jay Bruce's solo shot in the fourth put the Reds up 3-0. Xavier Paul scored on a passed ball in the ninth to complete the scoring for Cincinnati.
San Francisco's two runs came on a sixth-inning solo home run by Buster Posey and Joaquin Arias score on a wild pitch in the ninth.
The series resumes Sunday with game two in San Francisco at 9:37 pm EDT.
The Nationals and Cardinals open their best-of-five divisional series Sunday in St. Louis. Game time is 3:07 pm EDT.