Brett Gardner admitted the obvious: The Yankees are playing poor baseball and he isn’t getting it done.

“The way that we’ve played lately is not acceptable,” the veteran outfielder said. “We just have to find a way to be better — myself included.”

With so many Yankees struggling, manager Aaron Boone inserted Gardner into the third spot in the batting order — the spot in the lineup usually reserved for a team’s best hitter — but it didn’t help.

Gardner went hitless and the Yankees fell to the Orioles, 5-1, at Camden Yards, losing for the 13th time in 18 games. In the last 21 innings of the series at the hitter-friendly ballpark, the Yankees managed just two runs.