Richardson made his MLB debut with 1+1⁄3 innings of scoreless relief against the Toronto Blue Jays on September 28, 2009. He pitched in three games total games during his rookie campaign in 2009. Richardson made 26 appearances for Boston during the 2010 season, recording a 4.15 ERA with 12 strikeouts across 13 innings of work.[1]
Florida Marlins
On November 12, 2010, Richardson was traded to the Florida Marlins in exchange for Andrew Miller.[2] He appeared in 23 games for the Triple–A New Orleans Zephyrs, logging a 3-1 record and 3.66 ERA with 35 strikeouts. Richardson was designated for assignment by the Marlins on June 17, 2011.[3]
Atlanta Braves
On June 22, 2011, Richardson was claimed off waivers by the Atlanta Braves.[4] He was subsequently assigned to the Triple-A Gwinnett Braves, where he had a 6.00 ERA with 29 strikeouts in 23 games. On September 1, Richardson was removed from the 40-man roster and sent outright to Triple-A Gwinnett.[5] He was released by the Braves organization on December 16.
On January 25, 2012, Major League Baseball announced that, effective upon his signing by a major league team, Richardson would be suspended for 50 games for violating MLB's drug policy, having tested positive for amphetamine, Letrozole, Methandienone, Metenolone, and Trenbolone.[6]
On March 15, 2013, Richardson re-signed with the Skeeters. In 6 games (1 start) for Sugar Land, he posted a 1.04 ERA with 5 strikeouts across 8+2⁄3 innings pitched.
Los Angeles Angels of Anaheim
On June 15, 2013, Richardson signed a minor league contract with the Los Angeles Angels of Anaheim. He was assigned to the Triple-A Salt Lake Bees, and struggled to a 6.47 ERA with 50 strikeouts over 20 games. Richardson elected free agency on November 4.
On May 4, 2014, Richardson re-signed with the Angels organization on a minor league contract.[7] He returned to Salt Lake, and posted a 7.69 ERA with 56 strikeouts in 36 games.
Los Angeles Dodgers
On February 18, 2015, Richardson signed a minor league contract with the Los Angeles Dodgers. He pitched in 14 games in 2015 (with four starts) combined for the Double–A Tulsa Drillers and Triple–A Oklahoma City Dodgers and was 2–0 with a 2.08 ERA and 25 strikeouts.[8] He elected free agency on November 6.
On November 10, 2015, Richardson re-signed with the Dodgers on a new minor league contract. In 8 games split between Tulsa and Oklahoma City, he struggled to a 6.48 ERA with 12 strikeouts across 8+1⁄3 innings pitched. Richardson was released by the Dodgers organization on May 10, 2016.[9]
Long Island Ducks
On June 15, 2016, Richardson signed with the Long Island Ducks of the Atlantic League of Professional Baseball. In 13 games (4 starts) for Long Island, he registered a 1-3 record and 3.51 ERA with 24 strikeouts over 25+2⁄3 innings of work.
Sugar Land Skeeters (second stint)
On April 13, 2017, Richardson signed with the Sugar Land Skeeters of the Atlantic League of Professional Baseball. In 48 appearances for the Skeeters, he compiled a 1-4 record and 5.02 ERA with 62 strikeouts and 4 saves across 43 innings pitched. Richardson was released by Sugar Land on September 4.
Long Island Ducks (second stint)
On September 8, 2017, Richardson signed with the Long Island Ducks of the Atlantic League of Professional Baseball. In 6 appearances for the Ducks, he posted a 1-0 record and 4.15 ERA with 8 strikeouts across 4+1⁄3 innings pitched. Richardson became a free agent after the season.
York Revolution
On August 20, 2018, Richardson signed with the York Revolution of the Atlantic League of Professional Baseball. In 13 appearances for York, he recorded a 2.87 ERA with 27 strikeouts and 4 saves across 15+2⁄3 innings of relief.
Richardson re-signed with the team for the 2019 season. In 2 starts for the Revolution, he posted an 0-1 record and 4.50 ERA with 9 strikeouts over 8 innings of work. Richardson became a free agent following the season.
Toronto Maple Leafs
On July 4, 2023, Richardson signed with the Toronto Maple Leafs of the Intercounty Baseball League (IBL).[10] In 7 appearances for the club, he struggled to a 7.83 ERA with 20 strikeouts across 10+1⁄3 innings of work.
On April 21, 2024, Richardson re–signed with the Maple Leafs.[11] He made 8 scoreless appearances for Toronto, striking out 14 batters with 2 saves across 7+2⁄3 innings pitched.
On February 7, 2025, Richardson again re-signed with the Maple Leafs.[12]
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