John Costello

John Costello was a professional baseball pitcher born in 1960, who played in Major League Baseball from 1988 until 1991. Over the course of his career, he recorded an impressive win-loss record of 11-6 and maintained a commendable earned run average (ERA) of 2.97. Known for his effective pitching style, Costello struck out 104 batters and secured 4 saves, showcasing his versatility on the mound. Costello's playing years coincided with a transformative period in baseball, marked by the increasing emphasis on specialized roles within pitching staffs, which allowed him to carve out a niche as a reliable reliever and starting pitcher. His contributions to the teams he played for were significant, particularly in an era when pitchers faced increasing competition and the evolution of offensive strategies in the game. After his retirement on October 5, 1991, Costello left a lasting impact on the teams he represented, remembered for his competitive spirit and skill on the field.