McClelland has umpired in numerous noteworthy baseball games. He has been a World Series umpire four times (1993, 2000, 2002 and 2006), and worked in three All-Star games (1986, 1998 and 2003), calling balls and strikes on the last occasion. He has also called five Division Series (1997, 2000, 2002, 2004, 2006), serving as crew chief in 1997, 2004, and 2006. McClelland has officiated eight League Championship Series (1988, 1995, 1999, 2001, 2003, 2005, 2007, 2008 and 2009), serving as crew chief in 1999, 2003, 2005, 2007, 2008 and 2009.