CINCINNATI — The “worst performances of the season” category is way too cluttered for the Mets this early in the season, but the latest entry should be strongly considered.

Facing a menagerie of relievers in a Reds bullpen game on Wednesday, the Mets were toothless at the plate after Kodai Senga got jumped in the first inning, barely showing a pulse in a 5-0 loss at Great American Ball Park.

The Mets, who lost a fifth straight series, were shut out for the seventh time this season.

It was a seventh loss in nine games in what was regarded as a weak portion of the schedule, against the Tigers, Rockies and Reds — with four games remaining this weekend in Washington.

Overall, the Mets are 4-13 since starting a West Coast trip last month with seven victories in eight games.

Only Justin Verlander’s gem on Wednesday in which the ace right-hander allowed one run over seven innings prevented the Mets from getting completely embarrassed in this series.

Senga surrendered his most runs in a start since joining the Mets.

The right-hander was removed after five innings in which he allowed five earned runs on eight hits with seven strikeouts and one walk.

He became the Mets’ fourth starting pitcher in their last five games — Verlander was the exception — to pitch five innings or fewer.

Senga barely survived a first inning in which he threw 37 pitches and allowed four earned runs, facing nine batters.

Jonathan India doubled leading off the game for the Reds and after Senga recorded two outs, Jake Fraley delivered a bloop RBI single.

Tyler Stephenson singled on soft contact before Nick Senzel stroked an RBI double.

Henry Ramos walked before Kyle Newman singled in two runs.

With Tommy Hunter warming up in the bullpen, Senga struck out Curt Casali.

Over the next three innings Senga faced the minimum nine batters — including a strikeout of the side in the third — but the Reds extended their lead to 5-0 in the fifth on Spencer Steer’s two-out homer.

The Mets had trouble mustering any kind of offense against an assortment of pitchers.

In the third, Francisco Alvarez and Brandon Nimmo singled in succession, but Francisco Lindor and Jeff McNeil were retired in order to end the threat.

In the fifth, Mark Canha singled and Nimmo walked, but Lindor and McNeil were again retired, ending the threat.

Alvarez was thrown out at the plate attempting to score on Lindor’s single and the Mets went hitless from that point.