Rajon Rondo accepted responsibility for the Boston Celtics’ 0-2 start to the season.

“We have to trust one another defensively,” Rondo said after allowing 21 points and 13 assists to Brandon Jennings in a 99-88 loss to the Bucks on Friday. “It starts with me. I have to do a better job on the ball. We can say we [trust each other], but on the court it shows we’re not pulling in weakside [help]. There’s a lot of things.

“We’ve just got to start somewhere, and that’s the good thing about the league — we can start tomorrow.”

In two games, opponents have shot 50.3 percent against Boston, including 47.1 percent from beyond the arc.

“I’m going to try to come out and set the tone defensively [Saturday night against the Wizards],” Rondo said. “That’s all I can do. We’ve got to each look ourselves in the mirror and find a way to dig down and bring something to what we’ve been doing. Bring a little bit more to the game. I’m the point guard, I’m the first line of defense, I initiate the offense. I’ve got to be better.”