The game would have started a half hour later had the Oakland A's won the wild-card game.
The Orioles will send Chris Tillman to the mound in Game 1 against 2013 Cy Young Award winner Max Scherzer.
Kansas City advances to face the Los Angeles Angels in the other AL division series.
The start time for Game 2 on Friday at Camden Yards will be either 12:07 p.m. or 3:07 p.m. depending on who wins the National League wild-card game tonight. If San Francisco wins, the Orioles will be looking at a quick turnaround and a 12:07 p.m. start on Friday. If Pittsburgh prevails, the Orioles will play at 3:07 p.m.