Bonser attended Gibbs High School, compiling a record of 24-9 and a 1.99 ERA. In his senior year, he went 7-3, 1.88 and hit .523 with 11 home runs. He was named the 2000 Pinellas County High School Player of the Year and played in the 2000 Florida State All-Star game.\n', '

Bonser was selected out of high school by the San Francisco Giants in the first round (21st overall) of the 2000 amateur draft. Bonser made his professional baseball debut at age 18 for the Salem-Keizer Volcanoes. In 2001, he had a breakout season for the Hagerstown Suns, leading the South Atlantic League in wins (16), and finishing second in strikeouts (178), which earned him South Atlantic League Most Valuable Pitcher and Post-Season All-Star honors. After the season, he had his first name legally changed to his childhood nickname, "Boof".\n', '

From 2002 through 2003, Bonser progressed steadily through the Giants\' system, reaching the Triple-A level at the end of the 2003 season with the Fresno Grizzlies. On November 14, 2003, Bonser was traded to the Minnesota Twins organization, along with pitchers Joe Nathan and Francisco Liriano, for catcher A. J. Pierzynski, and cash. Bonser was assigned to AA New Britain for 2004, and was promoted to the Triple-A Rochester Red Wings for a spot start at the end of the season, then spent the entire 2005 season in Rochester.\n', '

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