Pecko (2-0) earned the win Sunday over the A's, allowing just one hit and no walks over three scoreless innings. He struck out two.
Lambert did not factor into the decision Sunday against the A's, allowing two hits and no walks across two scoreless innings. He struck out one.
Walker went 2-for-3 with a solo home run, two walks and two additional runs scored in Sunday's 9-0 win over the A's.
The Astros recalled Delgado from Triple-A Sugar Land on Sunday, Matt Kawahara of the Houston Chronicle reports.
The Astros optioned Blanco to the minors Sunday.
White went 2-for-3 with an RBI in Saturday's 13-2 loss to Houston.
Lambert will start Sunday's game against the Athletics in Sacramento, Chandler Rome of The Athletic reports.
Johnson will serve as the Athletics' opening pitcher for Sunday's game against the Astros, Martin Gallegos of MLB.com reports.
Williams (upper body) is not in the starting lineup for Friday's game against the Astros.
Williams (undisclosed) was scratched from Thursday night's lineup against the Astros, Martin Gallegos of MLB.com reports.
