Mata and Ward were both fallouts from last year's Spring Training. Mata was hoped to be used later in the season for Boston, IIRC, but went down right after Ward, again IIRC.
More good news on Mata, though I can't get to detail of the article. According to Speier and the Globe, his return to competitive pitching saw him at 100mph. There are no stats, though, so can only assume it was an intrasquad somewhere?