Feels like this needs to be spelled out:

This isn’t normal, what the Mariners pitching staff is doing these days.

Luis Castillo was the scheduled starter Tuesday at T-Mobile Park against the Atlanta Braves, looking to extend a run of pitching success that’s unprecedented in Mariners history.

In Monday’s 2-1 victory over the Braves — punctuated by Mitch Garver’s first career walkoff homer, in as entreating a regular-season game as you’ll ever see — the Mariners’ Bryce Miller and Atlanta’s Max Fried took dueling no-hitters into the seventh inning.

Miller, the Mariners’ 25-year-old right-hander from Texas, had perhaps the best start of his young career against perhaps the best lineup he’s faced, finishing with one run allowed, two hits, one walk and 10 strikeouts.

Over the past 17 games, Mariners starters have allowed a total of 18 earned runs. Their 1.53 earned-run average since April 10 is the best over a 17-game stretch in franchise history and the best in the majors by any starting rotation since Cleveland in 2017.