MILWAUKEE -- May has been incredibly kind to San Francisco Giants pitcher Ryan Vogelsong.

The veteran right-hander came into his start Wednesday with a 3-0 record and a 1.05 ERA in four starts this month and kept right on chugging against the Brewers.

Vogelsong held Milwaukee to a run and six hits and matched his season high with five strikeouts as San Francisco finished off a three-game sweep with a 3-1 victory at Miller Park.

"What a great job he did today," Giants manager Bruce Bochy said. "Good for him."

Vogelsong found himself in some trouble early but managed to work out of it each time.

He gave up triples to Brewers left fielder Khris Davis in the first and fourth innings but struck out two in a row to escape in the first and benefited from a heads-up defensive play that retired Davis at the plate in the fourth.

Milwaukee scored against Vogelsong later in the inning, taking a 1-0 lead on second baseman Elian Herrera's sac fly. But the Giants took the lead back in the fifth when second baseman Joe Panik belted a two-run homer off Brewers right-hander Mike Fiers.

Fiers was starting on short rest because of an injury to right-hander Wily Peralta and went five innings, allowing two runs and eight hits with six strikeouts.

"I could've made this pitch or that pitch in certain situations, but I battled," Fiers said. "They got those two runs, big hit by Panik in the fifth. That was the difference in the game."

Vogelsong left another runner stranded in the bottom of the inning but erased a one-out single by first baseman Adam Lind in the sixth with an inning-ending double play.

"I was definitely wearing down a little bit but still had enough to get through the inning," said Vogelsong, who threw a season-high 110 pitches and didn't walk a batter.

Vogelsong is now 4-0 with a 1.13 ERA in his last five starts.

"When I'm mechanically right, I can go out there and make pitches," Vogelsong said. "When I'm not, it's kind of a crapshoot and I'm all over the place. I've just been pretty clean mechanically and able to repeat it. That's really what's helped me, just locating my pitches."

San Francisco added an insurance run in the ninth when center fielder Angel Pagan scored on a pinch-sacrifice fly by Gregor Blanco.

Right-hander Santiago Casilla posted his 14th save with a perfect ninth.

It was the Giants' first sweep in Milwaukee since 2010. They finished their road trip with a 5-2 record and return to San Francisco 1 1/2 games behind the Los Angeles Dodgers, who played host to the Atlanta Braves on Wednesday night.

"This is one of the toughest road trips I've been on," Bochy said. "I think we were only able to get on the field (for BP) twice, but these guys never complained and they came out ready to go every day."

The Brewers were swept for the third time this season and at 16-32 own the worst record in the major leagues this season.

"I don't think we've played sloppy, I just think we've gone into this funk hitting, and we haven't matched up the hitting and pitching performance," Brewers manager Craig Counsell said.

"It's frustrating. They're frustrated. I'm frustrated. You have to earn these wins, though. They're not going to be given to you against a very, very good team. There's a game tomorrow. That's what you start looking towards right away. Do a better job putting pressure on the next guy."

NOTES: OF Angel Pagan returned to the Giants' lineup Tuesday but was dropped down to seventh in the order as he tries to snap out of a small slump. Pagan is batting .306 this season but just .205 in his last 11 games, including 0-for-7 in his last three. ... Milwaukee manager Craig Counsell said the team would wait before selecting a minor league pitcher to replace RHP Wily Peralta, who went on the 15-day disabled list Monday with a strained