Signed, sealed, delivered. Learner Tien of Irvine dominates down the stretch, overpowering Shevchenko 6-2, 5-7, 6-1, 6-0 to punch his ticket back to the Australian Open third round. 📸: ATP Tour | Australian Open #LearnerTien #AustralianOpen #USTASoCal #SoCalTennis #TeamSoCal