Evan Gattis made it to the big stage for the first time Wednesday, and the Braves rookie delivered a smashing performance.

A week after Gattis, aka El Oso Blanco, called making the opening-day roster the high point of his life so far, the big Texan topped it with a home run off Roy Halladay for his first hit in his major league debut, a 9-2 win against the Philadelphia Phillies at Turner Field.

“There’s no (words) to explain it,” said Gattis, who led off the fourth inning with a home run in his second plate appearance. “I’m glad I got that one out of the way. Couldn’t have planned it. Just excited. Happy. Little emotional after the game.”

Justin Upton hit his second homer in as many games in the first inning, and the Braves rolled over the Philadelphia on a cold, rainy night before an announced crowd of 24,289, improving to 2-0 to start the season. Paul Maholm allowed six hits in 5 2/3 scoreless innings, with one walk and six strikeouts.

Jason Heyward added a two-run homer off Jonathan Papelbon in the eighth for the Braves, who’ve hit six homers and outscored Philadelphia 16-7 in two games.

“Those guys in the lineup, they’re going to torture pitchers,” Maholm said of the Braves. “They’re going to have nights where they don’t, but I’ll take this lineup over any other.”

Halladay had nine strikeouts in just 3 1/3 innings, but was charged with six hits, five runs and three walks and gave up homers to Upton and Gattis. He threw 95 pitches (55 strikes) to get 10 ounds. Upton’s two-run homer fueled a three-run first inning, and Gattis hit a leadoff homer in the four-run fourth.

Gattis was the seventh Brave to homer in his major league debut since the team moved to Atlanta in 1966 and third to do it in four years, after Jordan Schafer in 2009 and Heyward in 2010.

“That’s awesome, man,” Heyward said. “I’m really happy for him. Roy Halladay’s not a bad one to have your first home run off of. But I’m also glad we won in his first home-run game. I feel like he did a good job behind the plate, too, calling a pretty good game, clearly, with (Maholm).”