Alston is an alumnus of Florida International University in Miami, Florida and Mercy College. He was drafted by the Colorado Rockies in the 10th round of the 1992 Major League Baseball draft. He made his MLB debut with the Rockies on June 6, 1996. He played in six games before pitching in his final game on June 18, 1996.\n', '

Alston coached in the Oakland Athletics organization from 2005 to 2015. He served as pitching coach of the Class A Kane County Cougars (2005–06) and Class A-Advanced Stockton Ports (2007–08), minor league rehab coordinator (2009–14), and minor league pitching coordinator (2015). The Arizona Diamondbacks hired Alston as their bullpen coach for the 2016 season. In June 2017, he was re-hired by the Athletics as the major league bullpen coach.\n', '

Alston is the cousin of former Major League Baseball outfielder Dell Alston.\n', '

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