Jay Powell

Most consecutive seasons pitched without a losing record among pitchers who primarily pitched in relief http://www.hardballtimes.com/the-anomalous-jay-powell/
James Willard "Jay" Powell (born January 9, 1972 in Meridian, Mississippi), is a former American baseball pitcher, who last played for the Atlanta Braves.
He was drafted by the San Diego Padres in 1990, but did not sign. Following his junior year at Mississippi State, he was drafted by the Baltimore Orioles in the first round (19th pick overall) in 1993 and signed. He played for the Florida Marlins, Houston Astros, Colorado Rockies, and Texas Rangers before signing with the Atlanta Braves in January of 2005.[1] His last game was on July 29, 2005, when he fractured his humerus. Thus, pitching again could lead to another fracture.
Powell was the winning pitcher of Game 7 of the 1997 World Series for the Florida Marlins.