Full circle moment🌀🎾 Irvine’s Learner Tien is the youngest American man to reach the quarterfinals at the BNP Paribas Open since his coach, Encinitas native Michael Chang, did it in 1992. 🎥: mlvytnns #SoCalTennis #BNPParibasOpen #TennisParadise #LearnerTien