The right-handed Martinez, who was recalled from Triple-A earlier in the day, fanned seven and allowed four hits in seven innings, including an RBI single to Matt Chapman ("Chappy") that capped Oakland's two-run seventh.
Graveman ("Digger") earned the win, completing seven innings with one run allowed in a six-strikeout performance. He scattered nine hits, stranding five on base as Texas finished 1-for-6 with runners in scoring position.
Adrian Beltre ("El Koja") brought in Texas' lone run with an RBI single in the first inning.
T.R. Sullivan has covered the Rangers since 1989, and for MLB.