The Chicago White Sox selected Logan in the 20th round (600th overall) of the 2002 Major League Baseball draft.[2] He advanced from the Sox's Rookie League affiliate, the Great Falls White Sox, straight to the major league club during spring trainingin2006.[3] Logan made his Major League debut on April 4, 2006, against the Cleveland Indians.[4] During 2006, Logan made 21 relief appearances with one save despite splitting his time in the Minors but accumulated an 8.31 ERA in the Majors that year.[5]
In 2007, Logan made 68 relief appearances, and was 2–1 with a 4.97 ERA.[5] In 2008, he made 55 appearances, going 2–3 with a 5.95 ERA.[5]
In 2011, he made 64 relief appearances going 5–3 with a 3.46 ERA.[5] Logan made an MLB-leading 80 relief appearances in 2012, going 7–2 with one save and a 3.74 ERA.[5]
In 2013, he made 61 appearances from the bullpen, going 5–2 with a 3.23 ERA.[5] On October 4, 2013, Logan underwent surgery in his left elbow to remove a bone spur.[9] He became a free agent at the end of the season.
On December 16, 2013, Logan signed a three-year, $16.5 million deal with the Colorado Rockies.[10][11]
On September 12, 2014, Logan again underwent surgery in his left elbow to remove a bone spur, abruptly ending his 2014 season.[12] In 35 games, Logan went 2–3 with a 6.84 ERA.[5]
Logan pitched in 60 games for the Rockies the following season, going 0–3 with a 4.33 ERA.[5] In 2016, he went 2–5 with a 3.69 ERA.[5] He became a free agent following the 2016 season.
On February 7, 2017, Logan signed with the Cleveland Indians to a one-year contract with an option for the 2018 season.[13] In 38 games with Cleveland, he was 1–0 with a 4.71 ERA.[5]
The Indians declined to exercise their club option on Logan's contract for the 2018 season on November 6, 2017, making Logan a free agent.[14]
On January 10, 2018, Logan signed a one-year deal with the Milwaukee Brewers worth $1.875 million.[15] On June 19, Logan was designated for assignment and was released on June 24.[16][17]
Logan threw with a sidearm delivery, making him appealing as a left-handed specialist. Left-handed hitters batted only .238 against him in his career, while righties hit .291.[18] Logan was especially tough against lefties because his primary pitch was a slider in the low 80s that breaks sharply away from them. This was his favorite pitch to throw in two-strike counts. He also had a four-seam fastball and two-seam fastball that appeared in the 92-95 mph range. Logan also threw a high-80s changeup from time to time against right-handers.[19]
