By Simon Jennings

(Reuters) -Novak Djokovic may have advanced to the third round of the U.S. Open, but the 24-time Grand Slam champion said he was struggling to solve his own tennis puzzle after a hard-fought victory over Zachary Svajda.

Djokovic dropped the opening set before rallying to win 6-7(5) 6-3 6-3 6-1 on Wednesday, but his post-match demeanour suggested a man wrestling with his tennis demons rather than celebrating another step toward a potential fifth U.S. Open title.

“I’m not pleased with my level of tennis, but, you know, you have days like this where you’re not playing at your best, but you just kind of find a way,” Djokovic said.

“I’m just trying to solve the riddle once I’m on the court.”

When asked about the frustration he showed during his match, Djokovic was charact

See Full Page