He replaces Jeff Smith , who was promoted to Double - A New Britain .
The 30 - year old Mauer , the older brother of 2009 American League batting champ and Twins catcher Joe Mauer , becomes the 10th manager in the Miracle 's 18 - year history .
Mauer replaces Jeff Smith , who was promoted to Double - A New Britain .
The 30 - year old Mauer , the older brother of 2009 American League batting champ and Twins catcher Joe Mauer , becomes the 10th manager in the Miracle 's 18 - year history .