Lopez was optioned to Triple-A Syracuse on Sunday, Dan Kolko of MASN Sports reports.
Called on to make a spot start Saturday against the Giants, Lopez failed to get past the fourth inning, as he conceded three runs on four hits and five walks. At just 22, Lopez has plenty of time to develop his skills, and certainly has a role in the team's future. He could be an option for a September call-up, if he's not back before then. For now, he'll settle back into the Syracuse rotation, where he owns a 1.80 ERA over three starts.