In just a matter of days, Novak Djokovic went from toiling in an error-strewn existence to Mr. Clean.<br />The world No. 1 held off a late charge from Roger Federer , winning 6-1, 6-2, 3-6, 6-3 to reach the Australian Open final once again.<br />But Thursday against the third-ranked Federer, Djokovic played tidy tennis for much of their 2-hour, 19-minute matchup, finishing with 33 winners and only 20 misfires.<br />"In the end of the day you are battling yourself the most," Djokovic said of his turnaround.<br />Djokovic's message was clear from the start against Federer: The 10-time major champion won 12 of the first 14 points en route to a two-set lead in just 54 minutes.<br />The world No. 1 had outrun, outhit and outplayed Federer in every facet of the game.<br />Djokovic now awaits the winner of Friday's other semifinal between No. 2 Andy Murray and No. 8 Milos Raonic.
