For the second straight night, that added up to an Atlanta rout.
McCann hit a two-run homer, Freddie Freeman had a pair of RBI doubles and Atlanta beat the Arizona Diamondbacks 9-1 on Friday.
Brandon Beachy (2-1) allowed four hits in 7 1/3 scoreless innings, striking out five and walking none as the Braves won their fourth in a row and ninth in 10 games after starting the season 0-4. In those 10 games, the Braves have scored 74 runs.
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"It's unbelievable," Beachy said. "They give me a one-run lead and then they build on it. The next thing you know I'm out there pitching and it's 7-0."
Trevor Cahill (1-1) gave up seven runs, four earned, and seven hits over 5 2/3 innings in his Chase Field debut for the Diamondbacks. Arizona has lost four straight, all at home.
"They are playing well," Arizona manager Kirk Gibson said. "We aren't playing so well right now, but we will be."
Atlanta has won the first two of the four-game series by a combined score of 19-3.
"Hitting's contagious," Freeman said, "and when people are getting hits, you want to go up there and knock them in. You don't want to lose those opportunities. Everybody feels good right now and everybody's taking advantage of it."
Freeman, who homered twice in Thursday night's 10-2 win, doubled in a run in the third and another in the sixth. The Braves' leader with 13 RBIs, he also singled and walked.
"I was pretty dialed in last year about July," Freeman said. "I feel about the same right now. I'm just getting the pitches to hit and I'm not missing them."
Paul Goldschmidt singled twice and walked for the Diamondbacks, scuffling offensively without injured Chris Young and Justin Upton.
Atlanta scored in the third when Martin Prado singled, then raced home from first on Freeman's double to the right-field corner.
Cahill retired the first two batters on groundouts in the fifth, but he walked Freeman on a 3-2 count, then McCann lined a 2-1 pitch over the right-field fence. McCann's third home run of the season put Atlanta up 3-0.
A fielding error by second baseman Aaron Hill on Chipper Jones' grounder opened the way for the Braves' four-run sixth.
Jason Heyward followed with a single. After a fielder's choice put runners at first and third, Beachy put down a bunt and Jones beat Cahill's throw home. Michael Bourn's double brought in another run, then Prado's sacrifice fly made it 6-0.
Craig Breslow relieved Cahill and gave up a double to Freeman, this one to the left-field corner, that scored the Braves' seventh run of the night.
Atlanta tacked on two runs in the ninth, including a bases-loaded walk by Arizona reliever Joe Paterson.
"There's really not much for me to say," Braves manager Fredi Gonzalez said, "other than, let's just keep it rolling. Let's play again tomorrow."
Beachy has allowed one earned run in three starts, giving him a 0.47 ERA. ... Heyward extended his hitting streak to 10 games, matching his career high. ... Jones was back after sitting out Thursday night's series opener to have fluid drained from his surgically repaired left knee. ... Upton again was out of the Arizona lineup with a sore thumb, although he was available as a pinch-runner. ... The Diamondbacks last lost four straight at home Sept. 4-7, 2010. .... Arizona sends lefty Joe Saunders (1-0, 0.64 ERA) to the mound against Tommy Hanson (1-2, 3.71) on Saturday night.