Marcum was born in Kansas City, Missouri and raised in Excelsior Springs, Missouri, where he attended Excelsior Springs High School. Athletically, besides baseball, he was a two-time State Champion in wrestling and a standout football player. Marcum initially attended the University of Missouri, but transferred to Missouri State University, playing on the 2003 College World Series team as a pitcher and shortstop.\n', '

Marcum was drafted by the Blue Jays in the third round, 80th overall, of the 2003 Major League Baseball Draft. He quickly rose through the minor leagues and made his major league debut on September 6, 2005 as a late season call-up when rosters expanded. He made his debut against the Baltimore Orioles pitching one scoreless inning, giving up a hit and one walk, with one strikeout. Marcum pitched 8 innings, giving up six hits, without surrendering a run during the month of September.\n', '

Marcum went 3–4 for the Blue Jays in 2006 in 21 games, including 14 starts, with an earned run average (ERA) of 5.06. In his final seven starts, he had a record of 2–1 with a 3.31 ERA.\n', '

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