Walker left Tuesday's game with discomfort in his right foot, Ryan Divish of the Seattle Times reports.
The right-hander only made it four innings (67 pitches) before the discomfort became too much, and he struggled when on the mound. Walker gave up five runs on five hits, including three home runs, and is on the hook for his eighth loss of the season. Of course, the foot discomfort has been a recurring issue for several weeks now, but Walker and the Mariners have been adamant that there is nothing structurally wrong with the foot. He has able to battle through the pain in his last start after skipping a turn.