Over a month into the regular season, the Mets rotation is finally starting to take shape. 

With more bad weather expected Tuesday in Detroit, Buck Showalter said Joey Lucchesi would start the series opener against the Tigers, which will allow Max Scherzer to pitch Wednesday in warmer temperatures in his return from his 10-game ban and Justin Verlander in his season debut after being sidelined since spring training with a teres major strain near his armpit. 

Showalter added that Kodai Senga is scheduled to pitch back in Queens on Friday versus the Rockies.

Senga last started on Wednesday, and the Mets are trying to take advantage of the schedule to give the right-hander extra time off as he adjusts to pitching more often in the majors than he did in Japan, where starters generally pitch once a week. 

Carlos Carrasco, like Scherzer and Verlander, threw prior to Monday’s doubleheader against the Braves at Citi Field. Showalter said he is likely to rejoin the rotation next week after being out with right elbow inflammation. 

They’ve been trying to survive with Lucchesi and Tylor Megill.

Showalter said he’s been impressed with Lucchesi, who pitched very well against San Francisco and was also effective against the Nationals in his previous outing. 

David Peterson was less successful in his fill-in role and was optioned to Triple-A Syracuse on Saturday. 

Showalter’s message to the left-hander about what he needed to do in the minors was simple: “Pitch better.” 

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Peterson has a 7.34 ERA in six starts, with his slider much less effective than it was a year ago. 

“There are a couple things we identified that are different than last year that he has to get back to,’’ Showlater said. “He’s 27 years old. He knows he needs to start grasping some of these things. He does. He will.” 

Verlander said he has altered his routine since suffering the strained teres major in an effort to lengthen the muscle and avoid a recurrence of the injury, which the right-hander said would be “catastrophic” to his season. 

“I think the injury was a cumulative effect of a lot of different things,’’ the 40-year-old said of the injury. “I made an adjustment mechanically that ended up not being the right one and put too much stress on the area, unfortunately.” 

He noted that Cleveland’s Triston McKenzie suffered a similar injury and hasn’t returned.

The 25-year-old McKenzie just threw his first bullpen session since being sidelined and isn’t expected back until late this month. 

The Mets’ bullpen machinations continued Monday, as Stephen Nogosek was activated from the 15-day IL before the opener and tossed 2 ²/₃ innings of scoreless relief in the 9-8 Game 1 loss.

Jose Butto was the 27th man for the second game.

Denyi Reyes, who gave up five runs in one-plus innings in the opener, was optioned to Triple-A Syracuse after the game and replaced by lefty Zach Muckenhirn, who has spent seven years in the minors.

Stephen Ridings was transferred to the 60-day IL to make room for Muckenhirn on the 40-man roster. 

Starling Marte, slumping for much of the last two weeks, hit the ball hard throughout Monday’s doubleheader. … Eduardo Escobar hit a pinch-hit homer against lefty A.J. Minter in the bottom of the ninth of the opener in his first plate appearance since Wednesday.