It’s time, Nationals manager Davey Johnson said, “to get a little mad.”

Tough to argue that point, especially after the Nats’ latest loss. St. Louis’ Adam Wainwright struck out nine Nationals en route to a 2-0 victory Tuesday night at Nationals Park.

The defeat was Washington’s fifth straight at home and the team that started the season 7-2 is now 10-10. Yes, indeed, it remains very early in the season. But early is about half-done and the Nats are in a funk.

Johnson said there will be “a few changes” when the Nats close out the series with the Cardinals on Wednesday. Game time is 1:05 p.m.

“I’m usually pretty patient,” Johnson said. “The effort’s there. We’re just not getting done. This has been about a week we’ve been real quiet offensively. It’s frustrating.

“When it rains, it pours. When you sometimes go in a little funk, it is magnified. And it is probably, the way I read this ballclub, everybody’s trying to do something, maybe trying to do a little too much instead of trying to do what’s there. Hit the ball hard somewhere, get on base, get some momentum going.”

Patient the Nationals weren’t. Wainwright needed four pitches to get out of one inning, five to get out of another. He struck out the side in the fourth. He struck out Adam LaRoche with the bases loaded in the sixth.

“I felt good early, and I tried to command what I was doing,” Wainwright said. “It’s a very, very solid lineup over there and they’ve gotten some numbers on me in the past. I knew that you could go two ways with it: You either remember those games and give them too much credit and go out there defeated already, or you say, ‘No, I’m a good enough pitcher to get anyone out.’ That’s what I chose to do.”