The Astros have optioned RHP Hector Ambriz to Triple-A Oklahoma City and recalled RHP Chia-Jen Lo from Double-A Corpus Christi and RHP Josh Zeid from Triple-A Oklahoma City, the team announced. Lo and Zeid_ will be making their debuts on an active MLB roster. Lo, 27, owns a 3.24 ERA with six saves in 17 appearances combined between Corpus Christi, Single-A Quad Cities and Single-A Tri-City this season. He has 20 strikeouts in 16.2 innings, while allowing a .234 opponent’s batting average. He joined Corpus Christi on July 10. Lo was one of the final cuts this spring where he had a 2.08 ERA_ in nine appearances for the Astros. [...]