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Career ERA+ Leaders:1.Mariano Rivera+/205/4, 2.Bill Foster+/164/623, 3.Bullet Rogan+/161/2345, 4. Jacob deGrom /156/423, Clayton Kershaw /156/847, 6.Pedro Martinez+/154/518, 7.Jim Devlin/150/1202, Satchel Paige+/150/708, 9.Lefty Grove+/148/1580
Single-Season ERA+ Leaders:1.Robert Keyes/540/1944/9, 2.Garnett Blair/428/1945/19, 3.Roy Parnell/421/1932/194, 4.Gene Richardson/364/1947/12, 5.Gready McKinnis/345/1941/12, 6.Leroy Matlock/336/1935/30, 7.Jimmy Shields/334/1928/65, 8.Bill Foster+/327/1925/27, 9.George Walker/325/194
Adjusted ERA+, often simply abbreviated to ERA+ or ERA plus, is a pitching statistic in baseball. It adjusts a pitcher's earned run average (ERA) according to the pitcher's ballpark (in case the ballpark favors batters or pitchers) and the ERA of the pitcher's league.
Win Expectancy, Run Expectancy, and Leverage Index calculations provided by Tom Tango of InsideTheBook.com, and co-author of The Book: Playing the Percentages in Baseball. Total Zone Rating and initial framework for Wins above Replacement calculations provided by Sean Smith.
ERA+ takes a player's earned run average (ERA) and normalizes it across the entire league. It accounts for external factors like ballparks and opponents. A score of 100 is league average, and 150 is 50 percent better than the league average.
ERA+ takes a player's ERA and normalizes it across the entire league. It accounts for external factors like ballparks and opponents. It then adjusts, so a score of 100 is league average, and 150 is 50 percent better than the league average. For example, Mariano Rivera's 2.21 career ERA was 105 percent better than the MLB average during the time ...
MLB Team Earned Run Average. More Team Stats... The stats on this page exclude preseason games, but include data from all other games, including the regular season and postseason.
