Peterson (0-1) took the loss against San Francisco on Thursday, allowing six runs (five earned) on nine hits and two walks while striking out five batters over 4.1 innings.
The Mets gave Peterson a 1-0 lead in the top of the first inning, but he quickly gave that back plus more, as the Giants responded with three runs in the bottom half of the frame. Things didn't get any better for Peterson from there -- he yielded two more runs in the third and was charged with one more following his departure in the fifth. Peterson did manage to fan five batters, but his overall line was pretty destructive for fantasy managers who deployed him. This was certainly a letdown for Peterson after he shut out Pittsburgh across 5.1 innings during his season debut March 28.