Sean Manaea knows his Mets postseason job is on the line

PHILADELPHIA — Frankie Montas was knocked out of the rotation before injury ended his season.

Kodai Senga’s prolonged struggles culminated with a demotion to Triple-A Syracuse.

The Mets have proven that performance generally dictates who stays and who goes.

They have also proven aggressive in reaching for the best arm available with a rotation that has three rookies.