Didi Gregorius doesn’t buy the talk that the postseason baseballs aren’t traveling as far as the ones used in the regular season. Yankees manager Aaron Boone isn’t sure.

Since Gregorius’ towering drive to right field in the fifth with two runners died so close to the wall he was asked if he felt the October balls aren’t going as far.

He replied with a quick, “No.’’

Boone was more expansive but not sure.

“I don’t know. Hard for me to say at this point,’’ Boone said after the Yankees’ 4-1 Game 3 loss to the Astros on Tuesday. “I have heard a couple of things about that. I don’t know.’’

Former Yankees great Andy Pettitte threw out the ceremonial first pitch that was caught by Austin Romine to chants of “Andy Pettitte, Andy Pettitte.’’

Boone’s father, Bob, was at Yankee Stadium for Game 3 in more of a supportive dad role.

Boone, a senior adviser to Nationals GM Mike Rizzo, was also scouting the Yankees, who could meet the Nationals in the World Series.

Monday night, father and son watched the Nationals’ NLCS win over the Cardinals on television as Washington took a 3-0 series lead.

“I did watch it with him, quite a bit of it,’’ Aaron said of his dad, a former big-league catcher and manager of the Royals and Reds. “It was reserved. Man, I can’t have too good of a conversation with him right now.’’

The Boone family was celebrating one of Aaron’s sons’ birthdays.

“We didn’t talk a lot about it, but [Stephen] Strasburg was obviously on top of things,’’ Boone said.

Asked about his reaction when he is mentioned among the candidates for AL Manager of the Year, Boone deflected talk to his team.

“We are entrenched in the Houston Astros and in the ALCS right now. That’s flattering and all but that’s more a product of what our team has done and what our organization has done,’’ he said. “But I am kind of consumed with this and hopefully going out and getting [a win] today.’’

A.J. Hinch of the Astros, Bob Melvin of the A’s, Kevin Cash of the Rays and the Twins’ Rocco Baldelli are the other candidates.

Family and friends of late NYP officer Brian Mulkeen were guests of the Yankees in the Judge’s Chambers in right field.