Aug 29, 2016; New York, NY, USA; Novak Djokovic of Serbia hits to Jerzy Janowicz of Poland on day one of the 2016 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Geoff Burke-USA TODAY Sports
NEW YORK (Reuters) - Novak Djokovic opened the defence of his U.S. Open title with a 6-3 5-7 6-2 6-1 win over Poland's Jerzy Janowicz on Monday, but the laboured performance gave rise to fresh concerns about the world number one's fitness.
After a sizzling start to the season that brought grand slam wins No.11 and 12 at the Australian and French Opens, Djokovic's form has plummeted, with a third-round loss to Sam Querrey at Wimbledon followed by a first-round exit at the Rio Olympics.
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