Djokovic, the two-time defending champion in Melbourne, hadn't lost a set, or for that matter, a service game in his first three matches.

WSJ: Wawrinka Shows Way to Beating Tennis's Big Four

And he couldn't provide a spark to a team that's lost four straight in regulation for the first time since a fourth-game skid from Feb. 26-March 6, 2011.

WSJ: Enroth stops 29 in Sabres' 1-0 win over Flyers