Donald Zackary Greinke called Zack, was born on October 21, 1983 in Orlando, Florida. He is relief pitcher for the Kansas City Royals.

High School
Zack graduated from Apopka High School in Apopka, Florida.

College
None

Minor Leagues
Although offered a scholarship to Clemson, Zack decided to sign with the Kansas City Royals, who selected him in the first round of the 2002 draft.

2002 - GCL Royals in the Gulf Coast League, then the Spokane Indians in the Northwest League, then the Wilmington Blue Rocks in the Carolina League
2003 - The Wilmington Blue Rocks, then the Wichita Wranglers in the Texas League
2004 - Omaha Royals in the Pacific Coast League
2006 - Wichita Wranglers in the Texas League

Major Leagues
Zack made his major league debut on May 22, 2004.

Zack's progress has been slowed due to a psychological disorder, social anxiety disorder, which caused him to miss most of the 2006 seaosn.