 He became the number one amateur in the World Amateur Golf Ranking after his performance in the U.S. Open and Patrick Cantlay's decision to turn professional.In 2012, after failing to advance to the Final Stage of PGA Tour qualifying school, 19-year-old Spieth turned professional midway through his sophomore year at Texas.He partnered with Under Armour for sponsorship in January 2013 and with BioSteel Sports Supplements in March.