Breaking: The Houston Astros have formally reached an agreement with the head coach of the Pittsburgh Pirates to assume the role of head coach, following the team’s abrupt reorganization.

After Justin Verlander logged six innings in the series opener Friday, giving up two runs on four hits, the Astros will visit the Washington Nationals on Saturday for the middle contest of a three-game set.

This weekend marks the celebration of the Nationals’ conquering of the Astros in the World Series five years ago. That began with Friday night’s game — a 5-3 win by Houston — and more activities are coming across the next couple of days.

Don’t expect the Astros to pay much attention.

“We have way more important things that we need to focus on right now,” manager Joe Espada said.

Meanwhile, the Nationals displayed their frustration when manager Dave Martinez was ejected Friday night for arguing. He was livid because obstruction wasn’t called when a Washington runner was called out at second base.

Aside from Verlander’s effort — he had four strikeouts and no walks in his six innings — that sequence turned into a main topic of conversation for Martinez after the game. And don’t rule out him offering a reminder to the umpiring crew this weekend of his opinion on the topic.

“I don’t know if they knew what I was arguing,” Martinez said. “I won’t argue a review. But the fact of the matter is they can sit down and get together and see. The fact that they can see it is brutal. I mean, (Ildemaro) Vargas almost broke his hand. The guy was blocking the base. That’s obstruction to me. I hope they look at the video and understand that that’s obstruction.”

The Nationals will go with right-hander Trevor Williams (2-0, 3.45 ERA) as their starting pitcher for Saturday’s game. He has lasted at least five innings in his first three starts, including in Sunday’s no-decision at Oakland.

Williams, who hasn’t surrendered a home run in 15 2/3 innings this season, is 0-2 with a 4.85 ERA in three career matchups with the Astros.