BALTIMORE — Aaron Judge’s afternoon began with news he was second in the American League in the first round of voting for the All-Star Game, trailing only the Angels’ Mike Trout.

His day went south after that in a 10-4 loss to the Orioles at Camden Yards on Wednesday.

Judge misplayed a line drive by Mark Trumbo with two outs in the bottom of the third that should have been the third out. Instead, the rocket went over Judge’s head and allowed two runs to score off a struggling Masahiro Tanaka.

“What really hurt was taking the first two steps in on a ball like that,” Judge said of the play. “If I take a step back, I probably get it.”

“That’s always the toughest one to read,” manager Joe Girardi said. “I thought it was right to him and the next thing you know it’s over his head. [Trumbo’s] a strong hitter. It happens … Aaron catches that ball, maybe [the game] is different.”

Then in the top of the fifth, after the Yankees had plated a pair to get back into the game, Judge came up with two on and one out and waved at a 3-2 changeup for the second out to keep the deficit at four runs.

It was a rare off night for the rookie, who trails only Trout and Washington’s Bryce Harper in the All-Star voting.

Starlin Castro said he wasn’t surprised by Judge’s popularity.

“He is the face of baseball,” said Castro, who leads the AL in votes among second basemen. “Like Trout.’’

It seems a foregone conclusion Judge will start the game in Miami in July, but he said again Wednesday he was unsure whether he would participate in the Home Run Derby.

“I am living the dream, getting paid to play a kids game, a game I have played since I was a little kid playing tee-ball,” Judge said. “Now I’m here playing for the New York Yankees and we are in first place. I am blessed in this situation. To be third in the All Star voting, I never thought that would happen.”

As for the derby, Judge reiterated he’s “not sure” if he’d participate if asked.

Given he entered Wednesday leading the majors with 17 homers, it’s just a formality he’ll be asked.

“Give me a couple of more weeks and I will have an answer for you,’’ said Judge, who added he participated in — and won — a home run derby during the College World Series in Omaha when he played with Fresno State.

Girardi said he wouldn’t stand in Judge’s way if the right fielder wants to take part in it.

“I’d never tell a player not to do it,’’ the manager said. “I sit here and watch him hit home runs when he’s not necessarily trying to hit home runs. The big thing about the home run derby is you don’t get hurt and you don’t change your swing. The only thing that doesn’t go out is his ground balls.”