Fernando Martinez (back) could begin the season on the 15-day disabled list. Martinez was scratched from Thursday's lineup due to lower back tightness and is scheduled to see a doctor in Houston on Friday. "I think it's the [left] oblique right now," said Martinez. "I feel a little more pain right now than I did before. Hopefully a couple of days off and I'll be back." If a stint on the disabled list is required, it wouldn't be surprising to see the Astros land an outfielder off waivers in the coming days.