Thomas (hamstring) said Friday that he has started facing live pitching and expects to start running bases next week, Alex Weiner of ArizonaSports.com reports.
Thomas landed on the team's 10-day IL on April 1 after sustaining a left hamstring strain. He hasn't done any fielding yet, but he has faced live pitches and is making progress in his rehab. Last season with the Diamondbacks, Thomas slashed .230/.273/.374 with nine home runs and 39 RBI over 402 plate appearances.