Bo Porter’s press conference ended Monday with the Astros manager telling the media they should ask outfielder J.D. Martinez why he was pulled during the fourth inning of a 3-0 loss to the Mariners.

“That was a manager’s decision,” Porter said. “You go ask him why he didn’t finish the game. I’m actually interested in what he’s going to tell you.”

Martinez started in left field, going 0-for-2 with one strikeout.

The 25-year-old followed Chris Carter in the top of the fourth, facing Seattle lefthander Joe Saunders with one out. Martinez swung at the first pitch he saw — an 87 mph four-seam fastball — and popped out to Mariners second baseman Dustin Ackley for the second out of the inning.

Asked about being pulled from the game, Martinez acknowledged making an unintentional mistake, fully apologized for his actions and said he didn’t want his teammates thinking he is selfish.

While he wouldn’t reveal the specific issue that caused Porter to pull him and substitute Ankiel, Martinez acknowledged it was a hitting issue that had been discussed during a pregame batters’ meeting.

Martinez said he understood Porter’s move and had no issues with the manager’s decision or how it was handled.

“From a baseball standpoint, I made a mistake (Monday),” Martinez said. “I had a mental error going up to the plate. It was totally my fault. I understand everything Bo did taking me out. I hold nothing against him, because what I did was unacceptable. It was a mental mistake that will never happen again.”

Asked if his mistake was related to swinging on the first pitch, Martinez didn’t deny it. But the outfielder again said he’d prefer not to reveal the exact reason he was pulled by Porter.