Loco Djoko: Novak Djokovic helped Serbia clinched a wild Davis Cup tie over the U.S.

The U.S. vs. Serbia tie produced plenty of drama thanks to The Djoker, who proved once again that the man's got more moods than Sybil. And the big man, John Isner, proved once again that he's quickly becoming the most dangerous player on tour. Learn more about your ad choices. Visit megaphone.fm/adchoices