Carmelo Anthony led six other Nuggets in double figures with 17 points in the Nuggets' third straight win and sixth in their last seven outings.
"We got a win and that's all that matters," said Kleiza. "We're definitely feeling good about ourselves now. We're just trying not to have any let-down games."
Charlie Bell led the Bucks' losing effort with a season-high 25 points as Milwaukee had six players in double figures.
"We weren't ready to play tonight," said Bucks Coach Scott Skiles. "It was just a very poor effort all the way around from everybody."