|Australian Open 20-19|
|Venue: Melbourne Park Dates: 14-27 January|
|Coverage: Daily live commentaries about the BBC Sport website, listen to Tennis Breakfast daily in 07:00 GMT on BBC Radio 5 live sports Excess Watching highlights on BBC TV and on the Web.|
The 37-year-old American dismantled Halep’s match to race throughout the opening set in 20 minutes.
Romania’s Halep, 27, recovered at the second, breaking up in what proved to be the final match.
Williams, seeded 16th, saved three break points for 3-3 from the decider, leading winning the upcoming game to capture control.
The 23-time Grand Slam champion comfortably held her next service game to edge nearer, and then served out for victory in 1 hour and 47 seconds.
Triumphantly hitting the atmosphere with both arms as she gave a steely stare towards her own box, Williams revealed how much aid she believed in beating the world number one.
“This had been an intense match and there had been some extraordinary things, but I really like being here,” she said.
Williams, searching on her very first Grand Slam title since returning in maternity last 12 months, has won nine of her 10 meetings together with Halep.
The seven-time champion will meet Czech seventh seed Karolina Pliskova, who beat Spain’s twotime Grand Slam winner Garbine Muguruza earlier in the day on Monday, from the last eight.
Eagerly-anticipated Match up doesn’t disappoint
This has been both hard fought, Halep staving off Williams at a lengthy opening match, until a sixth match which proved pivotal.
Halep got three break points – her initial chances of the end set – but a 171kph function down the center, accompanied by a weak forehand from the Romanian and still yet another booming serve, saw the opportunity slip.
That allowed Williams to take control at the crucial moment, Halep making still yet another unforced error with a forehand to deliver the break.
“I’m such a fighter. I never quit. It’s something which’s inherent,” Williams stated.
“It’s magic I’m here and I expect to do something I like “
By Kim Clijsters, four-time Grand Slam singles winner
Serena plays some of her very best Tennis if she’s got to. Simona started the match very gradually, and she worked her way in to the match but Serena held her very own and fought her way in to it.
She adhered into her game program and is likely to be quite relieved and very happy to go through this one.