Ethan Pecko Set for MLB Debut Wednesday as Astros Call Up No. 9 Prospect

Ethan Pecko is on the taxi squad and working out ahead of what is expected to be his Major League debut Wednesday, per Brian McTaggart of MLB.com. Per the report, the Astros are calling up their No. 9 prospect to start against the Angels at Daikin Park.

The timing fits a rotation that has been visibly unsettled. A previous Posterior item noted the Wednesday starter was listed as TBA when Houston set its rotation around Cristian Javier on Tuesday and Lambert on Thursday — leaving an open slot that Pecko is now reportedly stepping into. Ronel Blanco was also optioned to Triple-A amid what McTaggart has described as broader rotation concerns beyond Hunter Brown's command issues, further thinning the available options at the major-league level.

What we don't know yet

The callup is attributed to a source in McTaggart's report, not a formal club announcement, so the move should be treated as expected rather than finalized. Roster paperwork and any corresponding transaction to clear a spot have not been detailed in the material.

What to watch: how the Astros manage Pecko's workload in what would be his first big-league start, and whether the rotation picture stabilizes beyond Wednesday's game.