NEW YORK (AP) Novak Djokovic didn't see Roger Federer's between-the-legs shot Monday night.

He can easily visualize how it must've looked.

I've seen it live last year, passing next to me,'' he joked Tuesday.That's enough traumatic experiences for me.''

In last year's U.S. Open semifinal victory over Djokovic, Federer hit a back-to-the-court, through-the-legs passing shot for a winner. He made a nearly identical shot against Brian Dabul in the first round Monday.

Djokovic was asked if he'd seen it after he beat Viktor Troicki 6-3, 3-6, 2-6, 7-5, 6-3.

Today when Viktor tried to do the same thing, I said, 'No, no, please,''' Djokovic said.He was running for the ball between the legs. 'Please miss it. Please don't embarrass me again.'''