Why is Novak Djokovic always taking his shirt off?

Not that I mind one bit!

The Serbian tennis star edged Russian Nikolay Davydenko in a round robin match at the AYP Tour Finals and, for some reason, they decided to exchange shirts after it was all over!

It just made me realize that Novak, the 2008 Australian Open champion, rips off his shirt more than anyone in the history of the game!

And not just during tennis matches.

In some of the photos below, the cutie has modeled in some ATP fashion shows in nothing but his underwear.

That, as Martha Stewart would say, is a good thing!