Martin was recalled from Triple-A Reno on Tuesday and will start against the Dodgers.
Martin made five starts for the Astros in 2019, struggling to a 5.59 ERA before being shut down for Tommy John surgery. He was a fairly highly rated prospect prior to the injury, good enough to headline a trade for Zack Greinke even after undergoing the procedure, but he'll face a tough test against the defending champions in his first start for his new team.