McClelland was the first base umpire for Jack Morris' no-hitter on April 7, 1984 and was the umpire at third base for Nolan Ryan's sixth career no-hitter on June 11, 1990.
McClelland was behind the plate at Yankee Stadium when David Wells pitched a perfect game against the Minnesota Twins on May 17, 1998.
McClelland was umpiring at second base on April 21, 2012, when Philip Humber threw a perfect game.

McClelland also was the umpire during the 2003 game where famous slugger Sammy Sosa was caught with a corked bat at Wrigley Field during the interleague game between the Tampa Bay Devil Rays and the Chicago Cubs.
 Sosa broke his bat hitting a routine ground out, and upon inspection of the fragments of the bat, cork was found, leading to Sosa's ejection and subsequent suspension.

McClelland was the home plate umpire for the single-game playoff to decide the NL's 2007 wild card team, in which there was question as to whether Matt Holliday ever touched home plate, resulting in the Colorado Rockies defeating the San Diego Padres 9–8 in 13 innings.
He also worked the 2008 one-game playoff between the Minnesota Twins and the Chicago White Sox, which the White Sox won on a Jim Thome home run in the 7th inning 1–0.

During a spring training game on March 19, 2013, McClelland used the rare umpiring technique of calling balls and strikes from the infield while waiting for another umpire to put on the home plate gear after home plate umpire Seth Buckminster sustained a broken left hand and was forced to leave the game.
McClelland was the first base umpire for Jack Morris' no-hitter on April 7, 1984 and was the umpire at third base for Nolan Ryan's sixth career no-hitter on June 11, 1990. McClelland was behind the plate at Yankee Stadium when David Wells pitched a perfect game against the Minnesota Twins on May 17, 1998. McClelland was umpiring at second base on April 21, 2012, when Philip Humber threw a perfect game.
McClelland also was the umpire during the 2003 game where famous slugger Sammy Sosa was caught with a corked bat at Wrigley Field during the interleague game between the Tampa Bay Devil Rays and the Chicago Cubs.  Sosa broke his bat hitting a routine ground out, and upon inspection of the fragments of the bat, cork was found, leading to Sosa's ejection and subsequent suspension.
McClelland was the home plate umpire for the single-game playoff to decide the NL's 2007 wild card team, in which there was question as to whether Matt Holliday ever touched home plate, resulting in the Colorado Rockies defeating the San Diego Padres 9–8 in 13 innings. He also worked the 2008 one-game playoff between the Minnesota Twins and the Chicago White Sox, which the White Sox won on a Jim Thome home run in the 7th inning 1–0.
During a spring training game on March 19, 2013, McClelland used the rare umpiring technique of calling balls and strikes from the infield while waiting for another umpire to put on the home plate gear after home plate umpire Seth Buckminster sustained a broken left hand and was forced to leave the game.
Tim McClelland