Singleton to be called up by Astros, after last playing in majors for Houston in 2015
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Jon Singleton making MLB comeback years after weed suspensions
Houston Astros, as road warriors, live the good life at Globe Life
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Failed marijuana tests nearly ended Jon Singleton's career. Now the Astros slugger is asking what if
Houston Astros cut suspended ex-prospect Jon Singleton - ESPN
Astros call up former top prospect after eight years away from team
Houston Astros, as road warriors, live the good life at Globe Life
Houston Astros Jon Singleton wonders what could have been if marijuana testing ended sooner
Thoughts on Jonathan Singleton, suspended 100 games for his third positive drug test - MLB Daily Dish
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