AP photo by Matt Slocum / Houston Astros second baseman Jose Altuve celebrates with teammates after their 4-1 win against the New York Yankees in Game 3 of the ALCS on Tuesday night. Game 4 was scheduled for Wednesday but postponed a day because of rain.

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 American League 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 the Washington Nationals and their well-rested, talented rotation in the World Series starting in the AL city on Tuesday night.

With New York relying so heavily on its relievers this month, the starter-driven Astros may be at an advantage.

"If we're going to win this series, our bullpen will still play a huge role, obviously," Yankees manager Aaron Boone said. "But we've got to be able to get a little bit of distance out of our starters."

Houston will pitch Zack Greinke on Thursday against the Yankees' Masahiro Tanaka in a rematch of Game 1, with both on regular rest. Tanaka pitched six sterling innings as New York won 7-0 last Saturday.

The Astros also announced Justin Verlander will start Game 5 on full rest. He threw two-run ball into the seventh inning in a 3-2 victory that went 11 innings in Game 2 on Sunday.

"It was an easy decision," Astros manager A.J. Hinch said.

New York plans to counter Verlander with James Paxton. The left-hander was pulled after allowing a run over 2 1/3 rocky innings in Game 2, and concerns were raised he was tipping his pitches.

Tanaka has been New York's best bet for length this postseason. He needed just 68 pitches to cover six innings in the opener, improving to 5-2 with a 1.32 ERA in the postseason.

"Anytime the moment gets really big, he is good at slowing the game down himself and maybe taking even a little bit off of his pitches as opposed to powering through it," Hinch said. "We'd like to see us have a more disciplined approach, but that's easier said than done with the stuff he has."

Greinke, a 2009 Cy Young Award winner acquired from the Arizona Diamondbacks at the July 31 trade deadline, has struggled through two starts this postseason. He allowed six runs and couldn't finish the fourth inning against the Tampa Bay Rays in Game 3 of their AL Division Series, and the Yankees hammered two homers and scored three runs against him in six innings in Game 1 of the ALCS.

The Astros may also lean heavily on relievers in Game 6, if necessary, although their bullpen strategy will differ from New York's. While the Yankees probably wouldn't ask any one pitcher for more than two or three innings, Houston could stretch starter José Urquidy over four or five innings after sending out another pitcher to get the first few outs. That could keep the rest of the club's arms fresher during this four-day run.

"How beneficial it is is probably easier to answer after I see how guys perform and how the pitching plays out," Hinch said of the rainout. "But like I said, it's kind of a wait and see."

The previous postseason game to be postponed was Game 4 of the 2017 NLDS between the Nationals and the Chicago Cubs.