In contrast, over the last two seasons, no starting pitcher in the majors has exceeded 250 innings in a single year. The top three were David Price (2481/3), Johnny Cueto (2432/3) and Adam Wainwright (2412/3). All are well past their rookie seasons.

Now consider the Mets’ 2015 numbers.

Jacob deGrom, the ace of the Mets’ staff and the 2014 N.L. rookie of the year, has a solid 13-8 record with an impressive 2.64 E.R.A., but he has staggered of late. In his three September starts, he is 1-1 over 18 innings with a 5.50 E.R.A.

For the season, deGrom, 27, has worked 181 innings, about the number he compiled last year in Class AAA and the majors combined. At this rate, with up to three starts left in the regular season, he could edge just past 200.

Still, the Mets think he seems weary, and they are probably right. DeGrom is not Seaver or Koosman, at least not yet. So the Mets plan to push back or simply skip his next start, which is scheduled for early this week.

Then there is Matt Harvey, 26, who has had a solid season in his return from Tommy John surgery, with a 12-7 record with a 2.80 E.R.A. But in his two September starts before Sunday’s game — he became exhausted in one and was pounded in the other — he had an 8.49 E.R.A.