"2023, Cristopher Avello" The metric I feel is important and will be detailed in this summary is ERA+. Pedro Martinez in his third season for the Boston Red Sox posted a 1.74 ERA during the 2000 MLB season, when the league ERA was 4.92, registering him a 291 on a scale of 100. ERA+ is scaled so that a value of 100 means dead average, pitchers with a score above a 100 perform above average. The pitcher’s ERA+ is the same as the league’s park-adjusted ERA. To put Martinez’s ERA