NEW YORK: Novak Djokovic fears his lack of physical conditioning may come back to haunt him as he chases a record 25th Grand Slam singles title at the US Open.The 38-year-old Serbian superstar made a winning start to his latest tilt at glory on Sunday, defeating US teenager Learner Tien 6-1, 7-6 (7/3), 6-2 in 2hr 25min on the Arthur Ashe Stadium court.But Djokovic, who needed a lengthy medical timeout to treat a blister on his right foot between the second and third sets, admitted afterwards he was worried by a sudden loss of stamina during the second set.“I started great – just over 20 minute

Novak Djokovic delivered a lesson in grand slam tenacity to Learner Tien in the first round of the US Open, beating the American teenager 6-1, 7-6 (3), 6-2

Gegen einen Gegner, der halb so alt ist wie er, gewinnt Novak Djokovic nach einigen Mühen. Er will in New York dieses Jahr einen neuen Grand-Slam-Rekord aufstellen.