McCullers (4-3) gave up three earned runs on seven hits and four walks over four innings in Saturday's 3-2 loss to the A's. He struck out six.
The 22-year-old had control problems once again, issuing multiple free passes for the ninth time in his 10 starts this season. McCullers also surrendered the most earned runs he'd given up over the last four trips to the mound, and the four-inning stint was his shortest of the season. He'll look to rebound in his first post-All-Star break start.