Matz (8-6) allowed four runs on nine hits and one walk in 3.1 innings Wednesday in a loss to Boston. He had two strikeouts.
Matz didn't have any answers for the Red Sox, with the big blow coming on Jarren Duran's two-run triple in the fourth inning. The 30-year-old southpaw has dropped three of four decisions in July, with all those stumbles unfolding on the road. Matz has shown periodic flashes of effectiveness in his first year as a Blue Jay, but he now owns a bloated 1.38 WHIP in 18 starts and his spot in the rotation could be in jeopardy if Toronto adds any starting pitching prior to Friday's trade deadline.