The window for Kodai Senga to contribute to any potential playoff run continues to shrink, and it’s headlining a series of difficult and likely season-defining decisions facing manager Carlos Mendoza and the Mets’ front office.

After a promising first start with Triple-A Syracuse last week, Senga, who accepted a demotion to solve the curious case of his wonky mechanics, regressed Thursday, allowing four runs and six hits with two walks, four strikeouts, a hit-by-pitch and a wild pitch in 3 2⁄3 innings.

Perhaps most concerningly, he continued to showcase a notable dip in velocity, with his fastball dropping as low as 91.2 mph (his major-league season average is 94.7) and with similar diminished results across his ghost fork and cutter.

With the minor-league regular season ending

See Full Page