Rauch, weighing 290 pounds, was drafted in the third round of the 1999 amateur draft by the Chicago White Sox. He debuted with the White Sox on April 2,. In 2002, Rauch's first stint in the big leagues resulted in a 6.59 ERA in eight games and six starts. He did not play in the majors in, then returned to the majors in after a strong Triple-A campaign. However, against major league batters he again posted a high ERA of 6.23. In July 2004, Rauch was traded to the Montréal Expos along with Triple-A reliever Gary Majewski for Carl Everett.
Montreal Expos/Washington Nationals
On August 13, 2004, Rauch hit a home run against the Houston Astros off Roger Clemens, making him the tallest man ever to hit a home run in Major League Baseball. Despite a strong finish to the season in Montréal, Rauch was sent to the minors when the Expos moved to Washington. After putting up better numbers in the minors, Rauch finished the season with the Nationals, used mostly as a reliever, and going 2-4 with a 3.60 ERA. In, Rauch had his best season, posted a 4-5 record, a 3.35 ERA, and appearing in 85 games, second most in the NL. In, Rauch led the Major Leagues in appearances with 88. He finished the year with an 8-4 record, four saves, and a 3.61 ERA. His eight victories led the team in wins, a rarity in baseball for a relief pitcher. On February 2,, Rauch signed a two-year contract with the Nationals, worth a total of $3.2 million. Before being traded, Rauch spent most of the year as the closer in place of injured Chad Cordero. Rauch won the first game in the history of Nationals Park.
On August 28, 2009, Rauch was traded to the Minnesota Twins for RHP Kevin Mulvey. He appeared in 17 games for the Twins before the end of the season, posting a 5-1 record with a 1.72 ERA. On April 2, 2010, Twins manager Ron Gardenhire named Rauch the team's closer, replacing the injured Joe Nathan. On April 6, 2010 Rauch earned his first save as a Twin with a perfect ninth with two strikeouts versus the Los Angeles Angels of Anaheim in a 5-3 win. Rauch served as the team's closer through August, when the Twins acquired Matt Capps. During his time as closer, he saved 21 games in 25 opportunities. After the Twins acquired Capps, Rauch returned to his previous role as a set-up man and long reliever.
On January 17, 2011 the Blue Jays signed Rauch to a one-year deal worth $3.5M that included a club option for $3.75M in 2012. Blue Jays manager John Farrell suffered a dislocated jaw while attempting to restrain Rauch from going after umpire Alfonso Marquez during a game on July 2, 2011. Both Rauch and Farrell were ejected from the game. After pitching in a game against the Seattle Mariners on August 15, 2011, Rauch was taken to a Seattle hospital for an emergency appendectomy. He was placed on the 15-day disabled list on August 16, 2011. At the time of injury, Rauch led the Blue Jays in appearances, posting a 5-4 record with a 4.47 earned run average and 11 saves.
On December 6, 2011, Rauch agreed to a one-year 3.5 million contract with the New York Mets. On May 1st, 2012, Rauch faced Houston Astros 2nd Baseman José Altuve, The 18-inch height difference is believed to be the biggest between pitcher and batter with exception of a 1951 publicity stunt in which a 3-foot-7-inch Eddie Gaedel had one plate appearance for the St. Louis Browns.
On February 5, 2013, Rauch agreed to a one-year deal with the Miami Marlins. Rauch was designated for assignment on May 18. At the time of his designation, Rauch had a 1–2 record with an earned run average of 7.56. He was released on May 23, 2013.
Baltimore Orioles
On June 1, 2013, it was announced that the Orioles had signed Rauch to a minor league contract. On July 3, Rauch opted out of his minor league contract. He went 1-0 with a 2.89 ERA in 10 appearances over 9.1 innings, striking out 10.
On January 23, 2014, Rauch signed a minor league deal with the Kansas City Royals with an invitation to Spring training. He was released on March 28. Rauch retired following the 2014 season.
