Novak Djokovic enjoyed a stroll into the second round of the US Open at the expense of Ivan Ljubicic at Arthur Ashe Stadium but insisted it was not as easy as it looked.

TOP seed Dinara Safina survived a huge scare to beat Australian world number 167 Olivia Rogowska 6-7 (5-7) 6-2 6-4 and reach the US Open second round.