The best career postseason ERA from a Royals starter is Ventura's 3.98. All of their pitchers have pitched in the postseason before this year. All of them have struggled.
The Mets pitchers are all new to the postseason this year. deGrom has a 1.80, Syndergaard is at 2.77, and Harvey's at 2.84. Matz is the only "rough" spot with a 3.72 ERA.
The Mets were 2nd in the majors in walks allowed, more than 100 fewer than KC has allowed. If we can limit their baserunners and basically make them struggle in their pursuit to manufacture like they do, it'll be Mets all day and twice on Sundays.