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				Canadian qualifier Rebecca Marino rallied past Williams 4-6, 
				6-1, 6-2 in first-round action. Marino, 31, is ranked 111th in 
				the world, while Williams, 42, is currently unranked due to her 
				long absence. 
				 
				Williams hadn't played singles on tour since last August in 
				Chicago. The rust showed on her serve as she racked up 13 double 
				faults and just three aces. Marino had 10 aces and two double 
				faults. 
				 
				Another former world No. 1 player was in action on Monday, and 
				third-seeded Simona Halep of Romania downed Spain's Cristina 
				Bucsa 6-3, 7-5. 
				 
				Russia's Liudmila Samsonova ousted fifth-seeded Elise Mertens of 
				Belgium 7-6 (4), 6-4. 
				 
				Other first-round winners included sixth-seeded Kaia Kanepi of 
				Estonia, Australia's Daria Saville, the United States' Jessica 
				Pegula and China's Lin Zhu. Croatia's Donna Vekic eliminated 
				seventh-seeded Mayar Sherif of Egypt 6-4, 6-1. 
				 
				Mubadala Silicon Valley Classic 
				 
				Eighth-seeded Karolina Pliskova of the Czech Republic rallied to 
				beat Great Britain's Katie Boulter, 1-6, 7-6 (5), 6-3 in the 
				first round at San Jose, Calif. 
				 
				After dropping the first set, Pliskova went up 5-1 in the second 
				set but twice lost games while serving for the set. After 
				claiming the tiebreaker to level the match, Pliskova got through 
				a rocky third set that featured five service breaks. 
				 
				Four U.S. players, Amanda Anisimova, Madison Keys, Taylor 
				Townsend and Elizabeth Mandlik, won their opening matches. 
				Seventh-seeded Daria Kasatkina of Russia came from behind to 
				beat Elena Rybakina of Kazakhstan 1-6, 6-2, 6-0. 
				 
				--Field Level Media
 
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