John Costello (baseball)

John Reilly Costello is an American former relief pitcher in Major League Baseball who played for the St. Louis Cardinals, Montreal Expos and San Diego Padres. He batted and threw right-handed.
Costello graduated from Oceanside High School in Oceanside, New York in 1979 and then played college baseball at Mercyhurst where he led all of NCAA with a 1.12 earned run average in 1982.
In a four-season career, Costello posted an 11–6 record with a 2.97 earned run average and four saves in 119 games pitched.