DeGrom (elbow) threw 10 pitches off a mound Tuesday, Anthony DiComo of MLB.com reports.
It was a light session for the veteran right-hander as he continues his return from a partial UCL tear in his right elbow, but a return to mound work is still a significant step forward in his recovery. DeGrom is attempting to make a return before the end of the regular season, but time is running out with less than three weeks to go in the campaign.