That’s his 12th consecutive quality start. Go all the way back to July 22 for an Arroyo start in which he allowed more than 3 runs.
In his six starts in August, he posted a 1.99 ERA (fifth best in the majors for the month). So far in September he’s pitched 36 innings and allowed 8 runs (2.00 ERA).
His 2.34 ERA since the All-Star Break is fourth best in the majors (behind Wainwright, Greinke and Carpenter).