Brad Martin Hennessey (born February 7, 1980) is a former American professional baseball pitcher for the San Francisco Giants of Major League Baseball. He stands 6 feet 2 inches (1.88 m) tall and weighs 185 pounds (84 kg). He played for the Giants from 2004–08 and threw five pitches: a fastball, a slider, a changeup, a curveball, and a cutter.

Hennessey attended Youngstown State University and set several school records during his tenure with the team. In 2001, he was selected by the Giants in the first round of the draft. He did not pitch in 2002 because of surgery to remove a non-cancerous tumor from his back. In 2004, he reached the major leagues for the first time. He spent much of the 2005 season in the major leagues, making 21 starts and posting a 4.64 earned run average (ERA). In 2006, Hennessey spent time both in the Giants' starting rotation and the bullpen. He became a relief pitcher full-time in 2007, spending the entire season in the majors and closing for the Giants part of the time. After posting a 7.81 ERA with the Giants in 2008, Hennessey was outrighted to the minors; he refused the assignment and became a free agent. He attempted to pitch for the Baltimore Orioles in 2009 but was unable due to injury. Hennessey then spent parts of 2010 and 2011 in the minor leagues.

Hennessey was born on February 7, 1980, in Toledo, Ohio. In 1997, he graduated from Whitmer High School, where he was named a USA Today honorable mention All-American and won All-Ohio honors for his baseball playing. He went to Youngstown State University, where he played shortstop and pitched until his senior year, when he converted exclusively to pitching. As a senior, he had a 6–5 record and a 4.06 earned run average (ERA) in 16 games while setting school single-season records for innings pitched ( 88 ²⁄₃) and strikeouts (126). That year, he was named the Mid-Continent Conference co-Pitcher of the Year.

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