Federer v Del Potro is live right now and you can watch this match live at bet365 > sports > live streaming or at Ladbrokes (login and then open labdrokes' live streaming service)
Roger Federer looked slightly rusty as he knocked out Tomas Berdych in his last game, on the other hand Del Potro looks on fire. This should be an amazing Australian Open clash with all the makings of a classic.
To watch the live stream go to bet365 > Sports > live streaming now or go to Ladbrokes now (both sites require registration which takes 2 minutes)
Live Real-time updates
12:35 - What a breathtaking performance by Federer, he'll meet Andy Roddick in the semis and Roddick will be quaking in his boots now. Federer won an amazing 13 games in the row against Del Potro. The boss is back.
12:33 - Federer (2) 6-0 (0) Del Potro - In an hour and a half Federer wins the match.
12:32 - Federer (2) 5-0 (0) Del Potro - Federer continues the fantastic display.
12:28 - Federer (2) 4-0 (0) Del Potro - Del Potro has won only 4 points in this set.
12:25 - Federer (2) 3-0 (0) Del Potro - Humiliation? I think it's all over for Del Potro.
12:22 - Federer (2) 2-0 (0) Del Potro - Federer pulls some impossible shots.
12:20 - Federer (2) 1-0 (0) Del Potro - This is the 9th consecutive game for Federer.
12:15 - Federer gets set 2. He's playing suberply, even Del Potro is in awe, if you're a tennis fan and not watching this you're missing out on witnessing a genius at work.
12:13 - Federer (1) 6-0 (0) Del Potro - Nightmare for Del Potro, Federer dominates.
12:12 - Federer (1) 5-0 (0) Del Potro - Triple break of serve, ouch, poor Del Potro.
12:08 - Federer (1) 4-0 (0) Del Potro - Federer's forehand is finding all the angles.
12:01 - Federer (1) 3-0 (0) Del Potro - Free masterclass for Del Potro as Fed breaks.
11:57 - Federer (1) 2-0 (0) Del Potro - Federer holds, Del Potro shell shocked.
11:55 - Federer (1) 1-0 (0) Del Potro - Del Potro's night going bad to worse, Federer breaks to love.
11:50 - Former world number one, Federer, takes the first set without even breaking a sweat, Del Potro needs to get more aggressive and quick.
11:48 - Federer (0) 6-3 (0) Del Potro - Federer serves out the set in clinical fashion.
11:46 - Federer (0) 5-3 (0) Del Potro - Del Potro is making errors but still holds.
11:42 - Federer (0) 5-2 (0) Del Potro - Back to back love service. Federer is sharp.
11:38 - Federer (0) 4-2 (0) Del Potro - Technical play and big serves beat Federer.
11:36 - Federer (0) 4-1 (0) Del Potro - Opening set is headed Federer's way.
11:33 - Federer (0) 3-1 (0) Del Potro - First blood to Federer, the Argentine's broken
11:25 - Federer (0) 2-1 (0) Del Potro - Game Federer, strong and solid service.
11:20 - Federer (0) 1-1 (0) Del Potro - Big ground strokes from Del Potro work well.
11:18 - Federer (0) 1-0 (0) Del Potro - Federer takes the first game with big serves.
11:15 - And this fourth round clash begins, Federer serves the first game.
11:00 - Del Potro is out in his stylish vest and headband combo, Federer in matching headband but more traditional polo shirt, Rod Laver arena looks packed.
10:57 - Roger Federer and Juan Martin Del Potro will take to the court to start warming up very shortly.
10:55 - Dokic out, it's unfortunate that she can't progress but Safina is through to the Semi-finals and no doubt that Dokic will receive a huge round of applause.
10:50 - Safina recovers quickly indeed, with a break, the number 3 seed is now only 1 game away from knocking Dokic out.
10:45 - Dokic breaks, the crowd go crazy, Safina needs to recover quickly.
10:30 - Dokic remains just a break behind, it's going to be tough to get the break back, but the crowd certainly believe she'll do it.
10:20 - Some exquisite shots are paying off for Safina and she's a break up against Dokic, meanwhile Federer and Del Potro are waiting in the dressing rooms.
10:10 - Feel free to let your opinions be heard throughout the fixture by leaving comments below. Who thinks Del Potro could cause an upset?
10:05 - Not for the first time this tournament Federer and Del Potro will be late for their match, the Dokic v Safina game has gone to a decisive third set.
09:55 - The crowd are really behind Dokic, and it's surely only a matter of minutes before Safina is knocked out.
09:50 - The winner of Del Potro v Federer will face Andy Roddick in the quarter finals, Roddick forced Novak Djokovic out of the tournament earlier this morning.
09:45 - Jelena Dokic is on her way to another upset, it's all very exciting on Rod Laver and Federer and Del Potro haven't even started yet.
To watch the live stream go to bet365 > Sports > live streaming now or
Click here to go to ladbrokes live streaming (select Ladbrokes TV once you are logged in)