Ryan Franklin was a starting pitcher for just three full seasons in the major leagues. In 2002, he worked in a swing role for the Seattle Mariners. In 2003, he surprised many by posting a 3.57 ERA during a season in which he struck out just 99 hitters and walked 61 more over 212 innings pitched while allowing 34 home runs. His FIP that season was a staggering 5.24, and that 1.67 run difference is the largest difference for any starting pitcher with at least 150 innings of work since the 2000 season.
Franklin’s improbable season is just one of 32 instances of a starting pitcher’s ERA coming in at least a full run under his FIP over the past 13 seasons. The talent on that list of pitchers covers the entire spectrum of notable to awful; both Johnny Cueto and Joe Mays are on this list.