National League Division Series
Nauert umpired his first National League game on May 19, 1995, and was one of 22 umpires whose resignations were accepted in 1999 (the resignations were part of a failed union negotiating strategy). On being rehired in 2002, he became part of the Major League Baseball umpire staff. Nauert has worked the 2020 American League Wild Card Series, the 2004 American League Division Series, the 2008 National League Division Series, the 2010 National League Division Series, the 2013 National League Division Series, the 2014 American League Division Series, the 2016 National League Championship Series, and the 2017 National League Division Series. He was a part of the crew that worked both the MLB China Series (the first MLB games ever played in China) and the 2008 Japan Opening Series. Nauert also worked the 2009 Major League Baseball All-Star Game.