Jay William Marshall (born February 25, 1983 in St. Louis, Missouri) is a former professional baseball relief pitcher. He played in Major League Baseball with the Oakland Athletics in 2007 and 2009.
Marshall grew up in St. Louis. He is the son of Rich and Debby Marshall. He graduated from John F. Kennedy Catholic High School (Manchester, Missouri) in 2001.
Marshall was selected by the Chicago White Sox in the 25th round (750th overall) in the 2002 Major League Baseball Draft. However, he did not sign with the White Sox until next year on May 25, 2003. He played for the White Sox Rookie League team for 3 years from 2003 to 2005 before finally playing in Single-A for the Winston-Salem Warthogs in 2006.
He went 5-1 with 1.02 ERA in 2006 for the Warthogs.
On December 7, 2006, Marshall was selected by the Oakland Athletics in the Rule 5 draft. He was impressive for the Athletics during Spring Training in 2007, the first time he had been invited to Spring Training. He went 1-0 with a 2.76 ERA in 12 games and made the Opening Day roster despite never playing above Single-A ball.
He made his major league debut on April 2, 2007 and won his first game on April 15 against the New York Yankees.
Jay Marshall finished the 2007 season with a 1-2 record and a 6.43 ERA in 51 games. Following the season, on October 15, Jay Marshall was claimed off waivers by the Boston Red Sox. On December 6, 2007, Marshall was reclaimed by the Oakland Athletics. On December 11, 2007, Marshall was outrighted to the minor leagues to Triple-A Sacramento. Jay Marshall did not pitch in the majors during the 2008 season and made 10 appearances in the 2009 season, going 0-2 with an ERA of 14.73 in 7.1 innings.
On December 30, 2009, Marshall was designated for assignment by the Oakland Athletics to make room on the roster for Justin Duchscherer.
On January 8, 2010, Marshall was claimed off waivers by the New York Mets. On March 9, 2010, he was returned to the Oakland Athletics after the waiver claim was voided by the commissioner's office due to a pre-existing shoulder injury. The Athletics immediately released him.
He pitches with a submarine delivery.