Peterson took a no-decision against the Mariners on Saturday, allowing two runs on four hits and two walks in six innings. He struck out eight.
After recently shifting to the bullpen, Peterson delivered six strong innings in his return to the rotation Saturday following Edward Cabrera's (finger) placement back on the injured list. Peterson, who had been in line for the win before Jacob Webb blew the save, fanned a season-high eight in his third quality start of the season, all of which have come with the Cubs. Peterson will bring a solid 3.93 ERA, 1.31 WHIP and 40:19 K:BB over 50.1 innings for the Cubs into his next scheduled outing against the division-rival Reds.