Jon Singleton Bio
Jonathan Lee Singleton, known professionally as Jon 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, and he has also suited up for the Diablos Rojos del México of the Mexican League. Born on September 18, 1991, in Long Beach, California, Singleton entered professional baseball as a highly regarded prospect and debuted in the major leagues in 2014.
Singleton first gained national attention as a Phillies draft pick in 2009 and was later traded to the Astros in the deal that sent Hunter Pence to Philadelphia. He signed a landmark $10 million contract with Houston before ever playing in the majors. His career has included offensive flashes, off-field setbacks, and a determined return to the big leagues in 2023, where he posted the strongest results of his MLB tenure.
Early Life and Background
Jonathan Lee Singleton grew up in Long Beach, California, a coastal city with a deep baseball tradition. He attended Millikan High School in Long Beach, where he starred on the baseball team and developed into one of the most talked-about hitting prospects in the country. His combination of size, left-handed power, and plate discipline made him a frequent subject of scout conversations throughout his teenage years.
A few months before the 2009 Major League Baseball draft, Singleton committed to play college baseball at California State University, Long Beach. The commitment signaled his intentions to keep developing, but his strong senior season at Millikan put him firmly on the radar of major league clubs. The Philadelphia Phillies ultimately used the 257th overall pick in the eighth round of the 2009 draft to select him, even though he had been projected by some outlets to go as high as the second round.
Path to Baseball
After being drafted, Singleton quickly moved through the Phillies’ lower-level system. He opened his professional career in the Gulf Coast League in 2009, playing 31 games at the entry level of the minors. The following year, he joined the Single-A Lakewood BlueClaws and turned in a productive season, batting .290 with 14 home runs and 77 runs batted in (RBI) over the course of the campaign.
Heading into 2011, Baseball America ranked Singleton as the Phillies’ second-best prospect, signaling how quickly he had climbed the organization’s ladder. On July 29, 2011, the Phillies sent Singleton, along with Jarred Cosart, Josh Zeid, and Domingo Santana, to the Houston Astros in exchange for outfielder Hunter Pence. After the 2011 season, Baseball America named him the top prospect in the Astros’ system, and he was also invited to appear in the 2012 All-Star Futures Game.
Jon Singleton Career
Early Career (2009–2011)
Singleton’s earliest professional years were spent learning the rhythms of pro baseball. His 31 games in the Gulf Coast League in 2009 gave the Phillies a first look at his bat, while his 2010 assignment to Lakewood produced the first full-season line that justified his prospect status. The 2010 BlueClaws campaign, highlighted by a .290 average, 14 home runs, and 77 RBI, established Singleton as a name to watch.
His 2011 preseason ranking as the Phillies’ second-best prospect reflected how rapidly his stock had risen, and his inclusion in the Hunter Pence trade that summer immediately raised his profile within Houston’s system. By the end of that year, he was widely viewed as one of the top young first base prospects in baseball.
Houston Astros (2014–2015)
After off-field hurdles and a 50-game suspension in 2013, Singleton returned to the field and forced his way back into the Astros’ plans. On January 9, 2013, he received the 50-game ban following a second positive test for marijuana, a stretch during which he also spent time in a rehabilitation center. Houston added him to the 40-man roster after the 2013 season, and on June 2, 2014, the club signed him to a five-year contract guaranteeing $10 million that could have reached $35 million, a rare pre-debut extension.
Singleton made his MLB debut on June 3, 2014, against the Los Angeles Angels of Anaheim. He went 1-for-3 with a home run, two RBI, a walk, and two strikeouts, clubbing a solo shot off Matt Shoemaker for his first major league hit. Five days later, on June 8, he drilled his first career grand slam off Glen Perkins of the Minnesota Twins at Target Field. On August 2 against the Toronto Blue Jays, he hit an inside-the-park home run, a call that was initially ruled an out before being reversed following a challenge by Astros manager Bo Porter.
After opening 2015 with Triple-A Fresno, Singleton exploded offensively in May. On May 13, 2015, he drove in 10 runs, including a grand slam and a two-run homer against the Albuquerque Isotopes, setting a Fresno club record and falling one short of the modern Pacific Coast League mark held by Mike Moustakas. Over a five-day stretch, he collected 22 RBI, but his major league opportunities with the Astros dried up by the end of 2015, and he was placed on outright waivers in November 2016.
Milwaukee Brewers (2023)
Singleton signed a minor league deal with the Brewers on December 9, 2021, and spent the 2022 season with the Triple-A Nashville Sounds, where he batted .219/.375/.434 with 24 home runs and 87 RBI in 456 at-bats. He led all of minor league baseball that year with 117 walks, an indication of the patience that had always defined his offensive profile. The Brewers added him to their 40-man roster in November 2022 to protect him from the Rule 5 draft, then designated him for assignment after the Brian Anderson signing, released him, and re-signed him to a minor league deal in February 2023.
On June 3, 2023, Milwaukee promoted Singleton to the majors after an injury to Darin Ruf. In 11 games with the Brewers, he went 3-for-29 with two RBI before being designated for assignment on June 17. After clearing waivers, he elected free agency on June 21, closing a brief but notable chapter in Milwaukee.
Houston Astros (2023–2025)
Singleton rejoined the Astros organization on a minor league contract on June 24, 2023, and was assigned to the Triple-A Sugar Land Space Cowboys. After batting .333/.446/.692 with 12 home runs and 28 RBI in 33 games at Sugar Land, he was called up on August 8. That night against the Baltimore Orioles, he pinch hit against closer Félix Bautista, drew a walk, and scored the tying run on a go-ahead grand slam by Kyle Tucker in a 7–6 win. Three days later, on August 11, he homered twice and drove in a career-high five runs against the Los Angeles Angels, his first multi-homer game in the major leagues.
Singleton’s most consistent big league season came in 2024, when he hit .239/.321/.386 with 13 doubles, 13 home runs, and 42 RBI across 119 games and 405 plate appearances, both career highs. On September 10, 2024, he hit his first major league triple in a game against the Oakland Athletics at Minute Maid Park. He was released by the Astros on March 25, 2025, after failing to make the Opening Day roster.
Driving Style and Strengths
Singleton is a left-handed-hitting first baseman whose calling card has always been plate discipline. He regularly produced walk rates well above the league average, including a 21.4 percent walk rate in the 2017 minor league season and a Pacific Coast League-leading 117 walks in 2022. When he connected, his power was real, as his 10-RBI night in Fresno in 2015 and his 2024 totals with the Astros both showed, giving him the profile of a power-hitting corner bat when he was in rhythm.
Notable Events and Milestones
His first major league home run off Matt Shoemaker in June 2014, his first grand slam off Glen Perkins days later, and his inside-the-park homer against Toronto later that summer each marked early career highlights. The five-year, $10 million contract he signed before ever reaching the majors was the first extension of its kind for a drafted player without major league service time, a unique milestone in MLB history. His 2024 season, which included career highs in games played and plate appearances, stood as the most productive full major league year of his career.
Jon Singleton Career Wins
Singleton has notched memorable victories and personal milestones across the major and minor leagues, with his biggest moments coming in home run power and run production rather than in traditional win totals for a hitter. His career has been defined by signature offensive performances, including his 10-RBI game in Fresno and his five-RBI night against the Angels in 2024.
Major League Highlights
Singleton’s MLB totals through the 2025 season include 29 home runs and 104 RBI to go with a .197 batting average, reflecting a career that has been measured more by impact moments than by cumulative average. Among his brightest highlights are his debut homer off Shoemaker, his first grand slam off Perkins, and his first multi-homer game in 2024, which included a career-best five RBI against the Angels.
Other Wins and Performances
In the minor leagues, Singleton put together strong seasons at Lakewood, Oklahoma City, Fresno, Corpus Christi, Nashville, and Sugar Land, highlighted by his walk-heavy 2022 campaign at Nashville and his 2023 stretch at Sugar Land that earned him another big league call-up. Across those levels, he built the offensive foundation that allowed him to keep returning to the majors.
Jon Singleton Family
Family Background and Racing Lineage
Singleton grew up around friends who used marijuana, a detail he shared publicly after his 2013 suspension, and he entered a rehabilitation center following his second failed drug test. He has spoken openly about his struggles with substance abuse, acknowledging in 2018 that he considered himself a drug addict and was working to change. Otherwise, public information about his parents and broader family is limited.
Personal Life
Public information about Singleton’s personal life, including his marital status, spouse, and children, has not been widely reported. He has primarily been covered in the context of his baseball career, his suspensions, and his well-publicized return to the major leagues in 2023.
2025 Season Performance
Singleton’s 2025 season began with the Houston Astros, but he was released on March 25, 2025, after failing to make the Opening Day roster. He quickly caught on with the New York Mets organization on a minor league deal on April 2, 2025, and played 55 games for the Triple-A Syracuse Mets, batting .213/.353/.448 with 12 home runs and 42 RBI before being released.
He returned to the Astros on a minor league contract on June 22, 2025, and played 18 games for the Triple-A Sugar Land Space Cowboys, batting .254/.427/.460 with four home runs, 12 RBI, and one stolen base. On July 20, the Astros added him to the active roster after an injury to Isaac Paredes, but after going 1-for-9 across three games, he was designated for assignment on July 28. He cleared waivers, elected free agency on July 31, then re-signed with Houston on a minor league deal on August 5 before electing free agency again on November 6.
Looking ahead, Singleton remains a free agent after the 2025 season, and his next chapter appears likely to come in the Mexican League, where he previously starred for the Diablos Rojos del México in 2021. With his mix of patience, pop, and first base experience, he is positioned to pursue another opportunity, either back in affiliated baseball or in a winter league role.