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			 The eight-times winner of the event took more than two hours to 
			dispose of the world 56 and notch her 14th consecutive victory 
			against an American opponent. 
 The last countrywoman to beat her was big sister Venus in Montreal 
			in 2014.
 
 Playing on what almost amounts to her home court, Williams was not 
			in top form, making more than 40 unforced errors, but she finally 
			wore down McHale in the third set.
 
 "She's clearly capable of playing great tennis. She showed it 
			today," a relieved Williams, speaking of her opponent, told Tennis 
			Channel in an on-court interview.
 
			
			 "Miami is such a special place to me. I live so close to here," 
			continued the 21-times grand slam singles champion, who resides in 
			nearby Palm Beach Gardens.
 The hard-fought victory came only days after Williams was beaten by 
			Victoria Azarenka in the Indian Wells final in California on Sunday.
 
 In her only other tournament appearance this year, Williams lost the 
			Australian Open final to Angelique Kerber in January.
 
 In other women's second-round Miami matches, third seed Agnieszka 
			Radwanska advanced with a 6-0 6-1 cakewalk over Frenchwoman Alize 
			Cornet.
 
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			"I'm just very happy with that win, maybe the score was not showing 
			everything that was happening on the court," the Pole said.
 "But I think it was a great start and a couple of tight games at the 
			beginning of both sets was the key."
 
 Fifth seed Simona Halep also moved into the third round by beating 
			Daria Kasatkina 6-3 7-5.
 
 The biggest casualty was 11th-seeded Lucie Safarova of the Czech 
			Republic, who fell to Yanina Wickmayer of Belgium 6-2 6-3.
 
 (Reporting by Andrew Both in Cary, North Carolina; Editing by Larry 
			Fine/Patrick Johnston)
 
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