He umpired in the postseason in only his second year as a full-time major league umpire, and has worked two World Series (2012 and 2017), five League Championship Series (2010, 2013, 2014, 2015, 2020) and six Division Series (2005, 2007, 2009, 2011, 2012, 2017). Iassogna also worked the 2011 All-Star Game and the 2009 World Baseball Classic.