Jasson Dominguez, the highly touted 16-year-old outfielder who signed for a Yankees record $5 million signing bonus this summer, hit his first home run as a member of the ball club Wednesday night in the Dominican Instructional League.

“When I hit it, I knew the ball was going to leave the yard,” Dominguez told Baseball America of the shot to left field, “but it was not my best contact. I didn’t get it. I didn’t square the ball up.”

That type of power is part of the reason the Yankees used most of their $5.4 million international bonus pool money to sign Dominguez, who caught the attention of team director of international scouting Danny Rowland two years ago.

“[He’s] an elite-level athlete with elite baseball tools and the first time I saw him it was evident,’’ Rowland said at the time of the signing. “He’s the kind of player that makes the hair on your arm stand up when you watch him. When you watch him work out, when you watch him move and when you watch him play in games, he has a plethora of well-above average tools across the board that we hope, in time, will translate into usable skills at the major league level.”

Before Dominguez, the Yankees’ amateur signing record belonged to shortstop Dermis Garcia ($3.2 million in 2014), who spent most of last season hitting .247/.296/.491 in Single-A Tampa.

The game against the Giants was called off due to rain before Dominguez could get a second at-bat.