Failed marijuana tests nearly ended Singleton's career
Could Former Houston Astros Top Prospect Singleton Get Call-Up Soon? - Sports Illustrated Inside The Astros
Singleton homers twice in Verlander's 500th start to lead Astros over Angels 11-3 - ABC News
Welcome Back To The Show Jon Singleton, Houston Astros Make Another Brilliant MLBbro Maneuver
Brewers call up former prospect Jon Singleton, who hasn't been in MLB since 2015
Singleton to be called up by Astros, after last playing in majors for Houston in 2015 - The San Diego Union-Tribune
Pro baseball: Jon Singleton's debut with Astros is a mixed bag – Orange County Register
Astros sign first-base prospect Jon Singleton to five-year deal, call him up to majors - Sports Illustrated
Houston Astros promote Jon Singleton, sign to long-term contract - Minor League Ball
Brewers call up former prospect Jon Singleton, who hasn't been in MLB since 2015
Houston Astros GM hints at Jon Singleton call-up