In the outing, the 26-year-old Marcum allowed three runs on five hits -- two of the runs and four hits came during the first inning against Triple-A Rochester -- and finished with nine strikeouts and two walks. Marcum logged 104 pitches, including 71 for strikes, in the effort.
Barring a promotion, Marcum could make one more start for Syracuse on Monday against Scranton/Wilkes-Barre. Following that appearance, it's likely that the right-hander will rejoin Toronto and be inserted back into the starting rotation. Marcum is 8-6 with a 3.60 ERA in 22 starts for the Jays this season.
Marcum was sent to the Minors after struggling with his pitch location over a seven-start span, following a month-long stint on the disabled list due to a right elbow injury. After being activated on July 22, Marcum went 3-2 with an uncharacteristic 6.19 ERA and a .295 opponents' batting average, compiling 23 strikeouts and 16 walks across 36 1/3 innings.
Prior to landing on the DL, Marcum was one of the top starters in the AL, posting a 2.65 ERA while limiting hitters to a .198 average over 15 starts. He struck out 86 and walked just 27 over 98 2/3 innings and logged at least six innings in each of his starts, with the exception of a rain-shortened outing on May 18.
Jordan Bastian is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.