Jeffrey Alan "Jeff" Locke (born November 20, 1987) is an American professional baseball pitcher for the Miami Marlins of Major League Baseball (MLB). He previously played for the Pittsburgh Pirates, where he was an All-Star in 2013.

Locke is the son of Alan and Pam Locke and the grandson of Greta Locke. In 2003, his freshman year, he was a New Hampshire State Second-Team All-Star. In 2004, his sophomore year, he was a New Hampshire State First-Team All-Star. In 2005, his junior year, he was the New Hampshire player of the year and a New Hampshire State First-Team All-Star. In 2006, his senior season, he was the New Hampshire player of the year, a New Hampshire State First-Team All-Star, co-captain of the Kennett High baseball team, and he shared the Jack Burns Baseball Award. In June 2006, Locke graduated from A. Crosby Kennett High School. Locke is the all-time leader in wins for Kennett High School.

Locke is nicknamed "The Redstone Rocket". In June 2006, The Conway Daily Sun sports editor Lloyd Jones established the nickname because of Locke's fastball, the name of his hometown (Redstone, New Hampshire, a neighborhood within the town of Conway, New Hampshire), and in reference to America's first man in space, Alan Shepard of Derry, New Hampshire, whose Freedom 7 flight was launched by a Redstone rocket.

Locke was the first selection in the second round in the 2006 Major League Baseball draft by the Atlanta Braves. Locke was assigned to the Gulf Coast Braves (Rookie League) upon signing with the organization on June 18, 2006. In June 2007 the Atlanta Braves assigned Locke to the Danville Braves in the Advanced Rookie Appalachian League. In November 2007, Baseball America ranked Locke #8 on their Atlanta Braves Top 10 Prospects list. Locke played for the Rome Braves in 2008. In December 2008, Baseball America ranked Locke #7 on their Atlanta Braves Top 10 Prospects list. Locke started the 2009 season with the Myrtle Beach Pelicans. On June 3, 2009, the Braves traded Locke to the Pittsburgh Pirates along with Charlie Morton and Gorkys Hernández in exchange for Nate McLouth.

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