Mazur allowed one run on two hits and two walks while striking out one batter over 2.2 innings in a no-decision against Baltimore on Friday.
Mazur was called up from Triple-A prior to the contest to make his first big-league appearance since July 9. The rookie walked two batters in the first inning but emerged unscathed on the scoreboard, though he gave up a solo homer to Jordan Westburg in the second and a double to Gunnar Henderson in the third before being pulled with two outs. Mazur tossed only 39 pitches overall in the outing, but that appeared to be due to a short leash rather than any sort of injury. The right-hander has pitched to a poor 7.49 ERA and 1.81 WHIP through eight starts, but he may need to stick in the rotation until Yu Darvish (personal) or Joe Musgrove (elbow) is ready to return.