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Australian Open: Serena Williams relentlessly marches on as Naomi Osaka, Elina Svitolina survive scares

Serena Williams, seeded 16, has dropped just nine games in her three matches so far and with face either sister Venus or world number one Simona Halep for a berth in the quarter-finals.

United States' Serena Williams makes a backhand return to Ukraine's Dayana Yastremska during their third round match at the Australian Open tennis championships in Melbourne. (Photo | AP)