Madison Bumgarner has proved to be a handful no matter the venue. But at Citi Field, the Giants’ ace is nearly untouchable. The lefthander showed off that dominance Sunday in sending the Mets to a 6-1 defeat on a cold, dreary afternoon.

Bumgarner tossed six scoreless innings and improved to 4-0 with a 0.62 ERA in four career outings at Citi Field. “He’s kind of funky, really,” said Kevin Plawecki, who noted his trademark cross-body delivery.

That deception translated into another successful afternoon against the Mets. Bumgarner allowed six hits and walked three but struck out seven and proved especially tough with runners on base.

StoryConforto, Mets have tough time against BumgarnerStatsMets vs. Giants boxscore

“We put together good at-bats against him,” said Plawecki, who went 1-for-3 against Bumgarner. “We just didn’t get timely hits.”

During the first five games of their homestand, the Mets averaged 6.6 runs and hit eight homers. But Bumgarner threw cold water on a streaking offense.

At Citi Field, Bumgarner has an 18-inning scoreless streak that dates to September 2013. It is the longest such streak by an opposing starting pitcher since Citi Field opened in 2009.

advertisement | advertise on newsday

Among those with 25 innings pitched at Citi Field, Bumgarner’s 0.62 ERA is the lowest, besting Clayton Kershaw (1.01) and Doug Fister (1.05).

He’s all right

For the first time this season, Juan Lagares started in rightfield, where he should see some playing time when Curtis Granderson is out of the lineup.

Mets videos

Manager Terry Collins has hesitated to start Michael Conforto or Yoenis Cespedes in right, citing their lack of experience. Before Sunday, Lagares had started nine major-league games in right, though none since 2013.

Lagares went 2-for-4 with a walk and a run scored. He also had a triple turned into a ground-rule double in the seventh inning, when umpires ruled that a fan interfered with a ball down the rightfield line.

Extra bases

Before Sunday, the Mets had homered in five straight games. They entered with at least one homer in 12 of their previous 14 games . . . Buster Posey’s homer ended a 16 1⁄3-inning scoreless streak for Logan Verrett.