NEW YORK — A rainy day in the Bronx has left a most daunting October test for the New York Yankees vaunted bullpen: four games, four days and already a deficit to overcome against the Houston Astros in their AL Championship Series.

Game 4 of the ALCS scheduled for Wednesday night was postponed a day because of poor weather, with Game 5 pushed to Friday night at Yankee Stadium and Games 6 and 7 in Houston on Saturday and Sunday, if necessary. The Astros beat New York 4-1 on Tuesday to take a 2-1 series lead.

The winner will face Washington and its well-rested, talented rotation starting in the AL city on Tuesday night.