Quarterfinals at home. Not bad for a first. 🌴🎾 At just 20 years old, Learner Tien is into the first ATP Masters 1000 quarterfinal of his career at the BNP Paribas Open. He’s also the youngest ATP Masters 1000 quarterfinalist since 19 year old Sam Querrey at the 2007 Cincinnati Open. 📸: lexiewanninger #LearnerTien #USTASoCal #TeamSoCal #SoCalTennis #TennisParadise