It took more than two weeks, but the Milwaukee Brewers finally have their first two-game winning streak of the 2013 season.

Consider it baby steps for the Brewers, who have something to build on after a 10-8 victory over the San Francisco Giants on Tuesday night before a crowd of 29,075 at Miller Park.

Yuniesky Betancourt hit a grand slam during an eight-run third inning that carried Milwaukee, which hadn’t scored more than seven runs in a game this season, to a win in the opener of a three-game series against the defending World Series champions.

“If we can survive and we can do our job and just survive, I think we can win a lot of games until we get our full strength back,” said Brewers reliever Brandon Kintzler, who picked up his second victory in three days. “It’s just all about survival right now.”

Rickie Weeks and Jonathan Lucroy drove in two runs apiece, Carlos Gomez and Norichika Aoki each hit solo homers and Milwaukee made quick work of veteran left-hander Barry Zito, who entered the game with a 2-0 run and 14 scoreless innings to start the season.

Zito gave up nine earned runs in 2 2/3 innings to watch his ERA climb from 0.00 to 4.86. He fell to 0-5 with a 9.44 ERA in eight career starts at Miller Park.

Only two days removed from setting a club record by finishing off a 32-inning stretch without a run, the Brewers sent 12 batters to the plate in the third to chase Zito and turn a 3-1 deficit into a six-run lead.

A well-balanced attack was just what the doctor ordered for a Brewers offense that has been inconsistent this season as it copes with injuries to third baseman Aramis Ramirez and first baseman Corey Hart.

The Brewers have gotten consistent production out of the top three players in their order — Aoki, Jean Segura and Ryan Braun — but the rest of the lineup has struggled.

Milwaukee won Tuesday night despite Braun going 0-for-5 with the first four-strikeout game of his career.

Pitcher Wily Peralta and Segura sandwiched broken-bat singles around Aoki getting plunked by a Zito pitch to load the bases with no outs in the third.