The only personal catcher who could have helped Sonny Gray on Friday night at Yankee Stadium would be one placed beyond the outfield walls.

Aaron Boone is not a fan of the entire personal catcher thing, and this game was the perfect example why such a move is overrated in this day and age when catchers are armed with the same information.

It’s up to the pitcher to perform.

Sure the catcher can help a bit, but at some point it’s all on the guy with the ball in his hand on the mound, not Gary Sanchez, who sat in favor of Austin Romine.

That pitcher would be Sonny Gray and his bulging 6.39 ERA.

The Yankees have a major problem here and at some point probably will be forced to trade a highly touted prospect like Clint Frazier for starting pitching help because of Gray’s inability to be the pitcher the Yankees thought they were getting when they acquired him from the Athletics last year at the trade deadline.

Gray was atrocious in the 10-5 loss to the A’s at Yankee Stadium, lasting only five innings, surrendering a season-high nine hits, most of them rockets, and five earned runs. There were two home runs in the second inning, first by Khris Davis, a 421-foot blast to the right-center bleachers, the second, a two-run, 429-foot shot to center by Matt Chapman.

Boone pointed out that Gray “competed’’ and gave the Yankees five innings.

That’s a pretty low bar. He must give the Yankees more, no matter who is catching him.

Gray is 2-3 for the season and 6-10 as a Yankee. Consider that in five innings against Gray, the A’s scored as many runs as they did in a three-game series against the Astros’ pitchers, when they lost all three games and were outscored 24-5, and you get the picture.

Gray has yet to figure out how to pitch in New York and was heavily booed by the crowd of 43,093. Whether he is tipping his pitches or just is unable to finish off hitters, this kind of performance will not play here. He must improve.

“He allowed us to hang around enough to make a game of it,’’ was the way Boone spun the outing.

Much more is expected from Gray. This was the third time he has allowed at least five earned runs in a start in eight tries. He owns three of the Yankees rotation’s six losses on the season, including the only two losses from the starters since April 19.

“It definitely sucks,’’ Gray said. “But, you know, for me, it’s over with and we’ve got to move on and get ready for the next time I get out there.’’

The right-hander just can’t seem to find any rhythm and can’t put hitters away with two strikes.

Davis’ solo home run came on a 3-1 fastball. That happens. But Gray then surrendered a lined single to Matt Olson on an 0-2 pitch and the two-run home run to Chapman came on another 0-2 pitch.

That should not happen, especially early in the game. It was not as if Gray was working into the seventh inning and crumbled. To make the pitching night even more depressing for the Yankees, down at Triple-A Scranton/Wilkes-Barre, top prospect lefty Justus Sheffield was pulled from his start because of shoulder stiffness, according to reports.

“I felt good,’’ Gray said. “I just couldn’t put it together. I feel like my stuff was pretty good but at the end of the day they put five runs across the board in five innings, when you do that it’s going to be tough to win those games.’’

Gray put the Yankees in that 5-1 hole that they could not climb out of as reliever David Hale surrendered two solo home runs, one by Jed Lowrie in the sixth and then Matt Joyce in the eighth.

This was Gray’s first start against his former team and he came up small.

Not exactly top-of-the-rotation stuff. And after such a demanding series with the Red Sox, the Yankees did not have the offense to overcome all this poor pitching.