Novak Djokovic defeats 19-year-old Learner Tien to begin US Open campaign | Tennis News
Novak Djokovic, of Serbia, celebrates after defeating Learner Tien, of the United States (AP Photo/Frank Franklin II) Novak Djokovic, 38, began his quest for a record 25th Grand Slam singles title with a straight-sets victory over American teenager Learner Tien at the US Open on Sunday, despite requiring a medical timeout for a foot blister…