Kennedy (11-3) struck out five and walked two in his third straight win. He became the eighth pitcher in the NL with at least 11 wins. Jair Jurrjens of Atlanta leads the league with 12.
Zach Greinke (7-4) struck out seven with no walks in seven innings, allowing only five hits, but two of them were solo shots by Upton and Montero in the fourth inning.
Johnson added a two-run homer off LaTroy Hawkins in the eighth, his team-high 17th of the season.
Bryan Shaw and Ian Patterson pitched the eighth for Arizona, then David Hernandez completed the shutout in the ninth.
In Miami, Dustin Moseley and three relievers held Florida without an earned run and San Diego completed a series sweep.
Padres second baseman Orlando Hudson collided with the wall after catching a foul popup in the seventh inning and was carted off the field. He was taken to a hospital where X-rays were negative.
A team spokesman said late Thursday night that although Hudson did not fly on the team charter he did join the Padres in Philadelphia and is listed as day to day.
Cameron Maybin had four hits and scored twice for the Padres, who outscored the Marlins 23-6 in the series. Maybin went 9 for 14 in the three games against his former team.
Moseley (3-9) went six innings and allowed three unearned runs. He stayed in the game after a 2 1/2 -hour rain delay in the second inning.
Javier Vazquez (6-9) went only 4 1-3 innings and allowed five runs, the last on a bases-loaded walk.
In Denver, Jason Heyward and Freddie Freeman each homered and had two hits and Atlanta overcame a shaky start by Tommy Hanson.
Brooks Conrad homered and Nate McLouth had two hits for Atlanta, which earned a split of the four-game series.
Craig Kimbrel pitched the ninth for his 30th save.
Carlos Gonzalez homered for the Rockies before leaving in the fifth inning with a right wrist injury after fouling a ball off.
Hanson (11-5) allowed six runs and seven hits and struck out seven in six innings.
Trailing 6-5, the Braves took the lead for good against Matt Reynolds (0-2) in the seventh.
In New York, Albert Pujols hit a two-run homer in the first and Jake Westbrook threw eight excellent innings as St. Louis avoided a three-game sweep.
Pujols drove a pitch from Jonathon Niese (9-8) off the facade of the second deck in left for his 21st home run.
Westbrook (8-4) worked efficiently (90 pitches) and rapidly, and kept his infielders busy. He recorded 17 outs on groundballs, including two double plays, and allowed four hits and two runs.
