As a reliever, Robert Stephenson has a career-best 3.13 ERA in his first half of the season, a career-best ERA. That’s good enough to be ranked as the third best reliever in the National League, but his usage was also quite low. While Stephenson’s ERA is likely to improve over time, he is still likely to regress. His projected ERA in his next two seasons will be 4.44 and 111, respectively.