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			 Fellow American Scott Piercy was best after firing a blistering, 
			bogey-free round of nine-under-par 63 with compatriot J.B. Holmes 
			and Germany's Alex Cejka two shots back with 65s at the Golf Club of 
			Houston. 
			 
			Mickelson, the 2011 Houston winner, likes to sharpen his tournament 
			play the week before the major test at Augusta National and he got 
			off to a fast start. 
			 
			Beginning his round at the 10th, Mickelson birdied three of his 
			first four holes and added two more birdies to make the turn in 
			five-under 31. He got to seven-under before taking a bogey at the 
			finish when he failed to get up-and-down from a bunker. 
			  
			
			  
			 
			"If I can play well this week...it should be some good momentum for 
			next week," said Mickelson. 
			 
			Charles Howell III, Luke Guthrie and Shawn Stefani joined Mickelson 
			at six under par. 
			 
			Piercy, who also started on the back nine, used an even hotter 
			streak to take charge as he ran off five consecutive birdies from 
			the 18th and capped off the round with a birdie at his last hole. 
			 
			The 36-year-old Piercy, frustrated in his recovery from surgery to 
			repair a torn flexor in his right arm in February 2014, said he 
			found his proper swing plane during a marathon practice session two 
			days ago. 
			 
			"In my 13th hour, something kind of clicked and I figured it out," 
			Piercy said. "On Wednesday I kind of ingrained it, kept working on 
			it. And today was awesome, it really was. 
			 
			"It's been two years since I've really put a clubface on a ball like 
			I know how, like I feel like I should." 
			
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			Seven players were bunched at five-under 67, including Spaniard 
			Sergio Garcia, France's Victor Dubuisson, Canadian Graham DeLaet, 
			2012 winner Hunter Mahan and Matt Kuchar, who lost in a playoff here 
			last year. 
			 
			Sweden's Jonas Blixt, American Patrick Reed and 2009 champion Paul 
			Casey of England were in a large group at 68. 
			 
			(Reporting by Larry Fine in New York; Editing by Frank Pingue and 
			Mark Lamport-Stokes) 
			
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