This 2014 Kansas City Royal was certainly one of the most unlikely game 7 starters in history. Though he's started on opening day for 2 teams a total of 4 times, his career ERA+ is only 97, helped in no small part by being the only pitcher in MLB history to allow 10+ ER in more than one start, most recently in his lone 2017 MLB appearance with the Washington Nationals. Name him.
Jeremy Guthrie