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.
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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 minutes, first set, I felt really good,” Djokovic said.
