Jon Singleton Bio
Jonathan Lee Singleton is an American professional baseball first baseman who is currently a free agent. He previously played in Major League Baseball (MLB) for the Houston Astros and the Milwaukee Brewers, appearing in the major leagues across portions of multiple seasons. Singleton grew up in Long Beach, California, and was drafted by the Philadelphia Phillies in 2009 before being traded to the Astros organization in 2011.
His professional journey has featured early promise, a record-setting minor league contract, well-documented struggles with substance abuse, and a long road back to the major leagues in 2023. After time in the Mexican League and the minor league systems of the Brewers and Astros, Singleton has continued to pursue opportunities at the highest level of professional baseball.
Early Life and Background
Jonathan Lee Singleton was born on September 18, 1991, in Long Beach, California. He grew up in the same Southern California city and attended Millikan High School, where he developed into a highly regarded baseball prospect. During his high school years, Singleton established himself as a power-hitting first baseman with the type of offensive upside that drew national scouting attention.
A few months before the 2009 Major League Baseball draft, Singleton committed to play college baseball at California State University, Long Beach. However, his professional prospects moved faster than his college plans. Despite being projected as a possible second-round pick, his senior-year statistics caused him to slide to the eighth round, where the Philadelphia Phillies selected him with the 257th overall selection.
Path to Baseball
Singleton began his professional career in the Phillies organization, reporting to the Gulf Coast League Phillies for his first professional season in 2009. The following year, he advanced to the Single-A Lakewood BlueClaws, where he batted .290 with 14 home runs and 77 runs batted in (RBI). By the start of the 2011 season, Baseball America ranked Singleton as the second-best prospect in the Phillies system.
On July 29, 2011, the Phillies traded Singleton, along with Jarred Cosart, Josh Zeid, and Domingo Santana, to the Houston Astros in exchange for veteran outfielder Hunter Pence. The trade shifted Singleton into an Astros organization in the midst of a deep rebuild. Following the 2011 season, Baseball America designated Singleton as Houston’s top prospect, and he was later named to the 2012 All-Star Futures Game.
Jon Singleton Career
Early Career (2009-2013)
Singleton’s development in the Astros system was interrupted by off-field issues. In June 2012, he tested positive for marijuana, and a second positive test in December led to a 50-game suspension announced in January 2013. He acknowledged that he had been using marijuana on and off since he was 14 years old and spent a month in a rehabilitation center after the suspension. Despite the setback, the Astros added Singleton to their 40-man roster following the 2013 season.
Houston Astros Debut (2014-2015)
On June 2, 2014, the Astros signed Singleton to a five-year contract that guaranteed $10 million and could have been worth as much as $35 million, a groundbreaking deal for a player with no major league experience. He was promoted from the Triple-A Oklahoma City RedHawks and made his MLB debut on June 3, 2014, against the Los Angeles Angels of Anaheim, going 1-for-3 with a home run, two RBI, a walk, and two strikeouts. His first major league home run was a solo shot off Matt Shoemaker.
Singleton delivered several memorable moments during his rookie season. On June 8, 2014, he hit his first career grand slam off Glen Perkins of the Minnesota Twins at Target Field. On August 2, 2014, he hit an inside-the-park home run against the Toronto Blue Jays that was initially ruled an out but was reversed following a challenge by Astros manager Bo Porter. The Astros optioned Singleton to the Triple-A Fresno Grizzlies to start the 2015 season, where on May 13, 2015, he recorded 10 RBI, including a grand slam and a two-run homer against the Albuquerque Isotopes. The performance set a Fresno club record and fell one short of the modern-day Pacific Coast League record set by Mike Moustakas in 2010.
Setbacks and Mexican League Stint (2016-2021)
On November 19, 2016, the Astros placed Singleton on outright waivers, and he was assigned to Fresno. He played the 2017 season with the Double-A Corpus Christi Hooks and led all minor leaguers with at least 500 plate appearances with a 21.4% walk percentage. In January 2018, MLB announced that Singleton had failed a third drug test and would be suspended for 100 games. He publicly acknowledged a substance abuse problem. The Astros released him on May 21, 2018, during the final year of his contract.
On April 2, 2020, Singleton signed with the Diablos Rojos del México of the Mexican League, though the season was canceled due to the COVID-19 pandemic. After brief stints with the Guerreros de Oaxaca and a return to the Diablos Rojos, he appeared in 46 games for México in 2021, batting .321/.503/.693 with 15 home runs, 36 RBI, and four stolen bases.
Milwaukee Brewers Return (2022-2023)
On December 9, 2021, Singleton signed a minor league contract with the Milwaukee Brewers organization. He spent the 2022 season with the Triple-A Nashville Sounds, batting .219/.375/.434 with 24 home runs and 87 RBI, and led all of the minor leagues with 117 walks. The Brewers added him to the 40-man roster in November 2022 to protect him from the Rule 5 draft. After a brief designation and re-signing, Singleton was promoted to the major leagues on June 3, 2023, following an injury to Darin Ruf. In 11 games for Milwaukee, he went 3-for-29 with two RBI before being designated for assignment on June 17, 2023, and electing free agency on June 21.
Houston Astros Second Stint (2023-2025)
On June 24, 2023, Singleton rejoined the Houston Astros organization on a minor league contract and was assigned to the Triple-A Sugar Land Space Cowboys. After a strong performance at Sugar Land, he was called up to the majors on August 8, 2023, and made his season debut that night against the Baltimore Orioles at Oriole Park at Camden Yards, drawing a pinch-hit walk and scoring on a go-ahead grand slam by Kyle Tucker. On August 11, 2023, in his first game back at Minute Maid Park since 2015, Singleton homered twice and drove in a career-high five runs in an 11-3 win over the Los Angeles Angels, recording his first career multi-home run game in the major leagues. In 2024, he played in 119 games with 405 plate appearances, both career highs, batting .239/.321/.386 with 13 doubles, 13 home runs, and 42 RBI, and hit his first major league triple on September 10, 2024, against the Oakland Athletics. The Astros released him on March 25, 2025, after he failed to make the Opening Day roster.
New York Mets and Final 2025 Stints (2025)
On April 2, 2025, Singleton signed a minor league contract with the New York Mets. In 55 appearances for the Triple-A Syracuse Mets, he batted .213/.353/.448 with 12 home runs and 42 RBI before being released. On June 22, 2025, he returned to the Houston Astros organization on a minor league contract and was assigned to the Triple-A Sugar Land Space Cowboys, where he batted .254/.427/.460 with four home runs and 12 RBI in 18 games. He was added to Houston’s active roster on July 20, 2025, following an injury to Isaac Paredes, and after going 1-for-9 over three games, he was designated for assignment on July 28, 2025. After clearing waivers, he elected free agency on July 31, 2025, re-signed with Houston on a minor league contract on August 5, 2025, and elected free agency again on November 6, 2025, at the end of the season.
Driving Style and Strengths
Singleton is recognized primarily for his plate discipline and power potential from the left side of the plate. His walk-heavy minor league profile, including leading all of the minor leagues with 117 walks in 2022, reflects an offensive approach built on patience and on-base ability. His power output has been his most consistent tool, evidenced by multiple grand slams, multi-home run games, and a 10-RBI performance at Triple-A Fresno in 2015.
Notable Events and Milestones
Several moments have defined Singleton’s career, including his MLB debut home run off Matt Shoemaker in 2014, his first grand slam off Glen Perkins, a 10-RBI game that set a Fresno Grizzlies club record in 2015, and his return to the major leagues in 2023 after years away from the sport. His 2018 public acknowledgment of substance abuse and his subsequent comeback stand as the most personal and closely watched chapters of his professional life.
Jon Singleton Career Wins
Singleton’s career highlights are spread across the minor leagues, the Mexican League, and Major League Baseball. His most celebrated individual performances include multi-home run games, grand slams, and record-setting RBI totals at the Triple-A level. He has also been a consistent on-base presence in the minor leagues, leading all qualified minor leaguers in walk percentage in 2017 and in total walks in 2022.
MLB Highlights
Singleton’s MLB highlights include his debut home run on June 3, 2014, his first grand slam on June 8, 2014, and a five-RBI game with two home runs against the Los Angeles Angels on August 11, 2023. His 2024 season represented his most extended MLB workload, with 119 games played, 13 home runs, and 42 RBI.
Other Wins and Performances
In the Mexican League, Singleton batted .321/.503/.693 with 15 home runs, 36 RBI, and four stolen bases across 46 games for the Diablos Rojos del México in 2021. His 2022 minor league campaign with the Nashville Sounds produced 24 home runs and 87 RBI, while his 2023 stint at the Sugar Land Space Cowboys featured a .333/.446/.692 line with 12 home runs and 28 RBI in 33 games, performance that earned him his return to the major leagues.
Jon Singleton Family
Family Background and Racing Lineage
Public information about Jon Singleton’s family background is limited, and detailed records of his parents and any extended family connections to baseball have not been confirmed in available sources.
Personal Life
Singleton has spoken candidly about growing up around friends who used marijuana and has publicly described his struggles with substance abuse, including a month spent in a rehabilitation center following his 50-game suspension in 2013. He has not publicly disclosed details of a spouse, partner, or children in available sources.
2025 Season Performance
Singleton’s 2025 season was defined by frequent movement between organizations and levels. After being released by the Astros in March 2025, he signed with the New York Mets and played at Triple-A Syracuse, where he produced a .213/.353/.448 line with 12 home runs and 42 RBI in 55 games. The Mets organization released him before he returned to Houston on a minor league contract in late June.
Following his third stint with the Astros organization, Singleton was called up to the major leagues on July 20, 2025, after an injury to Isaac Paredes. He appeared in three games for Houston, going 1-for-9, before being designated for assignment on July 28, 2025, and electing free agency a few days later. He re-signed with Houston on a minor league contract on August 5, 2025, and finished the year at Triple-A Sugar Land before electing free agency on November 6, 2025.
Singleton’s 2025 campaign reflected both his ongoing resilience and the challenges of finding a stable major league role. With his long track record of plate discipline and power, he remained a viable depth option for organizations looking for a left-handed first baseman with big league experience.