Just when Mets’ fans thought it couldn’t get any worse, the Mets followed up a miserable road trip with a loss at home to the Brewers 2-1 on Monday night.

Even having Justin Verlander on the mound couldn’t fix what’s ailing the Mets, as they dropped their fifth in the last six games — and 16th of 21 — as the season that began with enormous expectations continues to spiral out of control.

They are now a season-worst eight games under .500 (35-43), a season-worst 16 games back of the NL East-leading Braves and 8 games behind in the wild-card race.

“I don’t think anyone saw this coming,’’ Verlander said, seemingly stunned at what he’s become a part of.

On Monday, Verlander pitched five scoreless innings, but needed 100 pitches to get there and had to be replaced to start the sixth.

Drew Smith, fresh off a 10-game ban for violating the league’s sticky substance policy, entered with a one-run lead and gave up a two-run homer to Joey Wiemer to put Milwaukee ahead.