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			 For top seed and 18-times grand slam champion Serena, her win 
			over former world number two Vera Zvonareva, on the comeback trail 
			after a 2014 season blighted by injury, was expected. 
 Venus's struggles with Sjogren's syndrome, an auto-immune disease, 
			have made every match she plays a lottery, but the 18th seed had 
			little trouble accounting for fellow American Lauren Davis 6-2 6-3.
 
 Thirty-four year-old Venus was dumped from the first round last year 
			but now finds herself on a seven-match winning streak after 
			clinching the Auckland Open title in the lead-up.
 
 "She is really motivating. She is playing so well, she's doing so 
			good right now," Serena, who famously completed the 'Serena Slam' by 
			beating her sister in the 2003 final at Melbourne Park, told 
			reporters.
 
 "Yeah, it makes me look behind my shoulders and I have to play 
			better and I want to do better.
 
			
			 "I always want to be able to stay ahead as much as I can. So I think 
			that's been, for our whole careers, we've kind of motivated each 
			other. We hopefully continue to do that."
 Venus faces a tough third-round match against 33rd-ranked Camila 
			Giorgi, a feisty Italian counter-puncher, who has broken into the 
			top 50 with a bullet.
 
 NO PRESSURE
 
 Serena, who will meet Ukrainian 26th seed Elina Svitolina, paid 
			tribute to her seven-times grand slam-winning sister for setting up 
			the platform for her own success.
 
 "She came in as a new face, a black woman that was shaking up the 
			world," she said. "She had all the pressure on her shoulders. I kind 
			of came in behind her.
 
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		 "There was no pressure on me at all... She had a lot of 
			confidence and she had so much class and still does throughout 
			everything.
 "You can see that her personality is pretty much the same. She's 
			definitely grown but she's always been very mature and very regal."
 
 Venus said her battles with health problems had not lessened her 
			desire for more titles after more than 20 years as a professional.
 
 "Honestly, I think I understand the game a lot more," she said. 
			"Even when I'm not playing as well, I think I'm able tactically to 
			be more strategic than even, let's say, Venus of 2000.
 
 "So that's one of the beauties of continuing to play as you get a 
			lot of the years under your belt."
 
 (Reporting by Ian Ransom; Editing by Patrick Johnston)
 
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