John Joseph "Jack" Cust III is an American professional baseball designated hitter and outfielder in the New York Yankees minor league organization. Cust attended Immaculata High School in Somerville, New Jersey. In 1997, he was first-team High School All-American at first base and did not attend college as he was drafted out of high school. In 1997, Cust, coming out of high school, was the first round draft pick of the Arizona Diamondbacks, and had a .447 on-base percentage in 35 games in the Rookie League. Cust was a Pioneer League All-Star in 1998, where he led the league in walks ,... on-base percentage , and runs scored . In 1999, he led the California League in homers , on-base percentage , and slugging percentage , and was Baseball America's 1st team Minor League All-Star DH, California League All-Star, and the Arizona Diamondbacks Minor League Player of the Year. In 2000, he had a .440 on base percentage at El Paso in the Texas League while leading the league in walks and strikeouts .
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| Birthdate: | January 7, 1979 |
| Birthplace: | Flemington, New Jersey |
| Age: | 33 |
| All Positions Played: | Outfielder, Designated hitter, Left fielder |
| Religion: | Roman Catholicism |
| Also known as: | John Joseph Cust III |