Novak Djokovic gets by but faces tougher tests

Novak Djokovic will go back into action at the US Open today after brushing off concerns about his fitness, the defending champion battling past Jerzy Janowicz in the first round of the US Open.

Djokovic had to call for a medical time-out just five games into the contest inside Arthur Ashe Stadium, when a trainer massaged the upper part of his right arm.

The Serbian, who has admitted an injury to his left wrist has also not healed, looked uncomfortable throughout but he did enough to beat Janowicz 6-3 5-7 6-2 6-1.