Four years ago, almost to the day, the Chicago Cubs and Baltimore Orioles traded right-handed pitchers, with the Cubbies sending Scott Feldman to the O’s in exchange for Jake Arrieta. (There were some other players included, but Feldman and Arrieta were the primary pieces in the trade.)
At the time, Arrieta was 27 years old, a former highly touted prospect who had yet to live up to his promise. Feldman had just turned 30 and had really only had one good season in his career, but he had a 3.46 ERA (with good peripheral numbers) at the time and had started 20-plus games in four of the previous five seasons.