Melbourne, Jan 23: Second-seeded Serena Williams of the United States defeated Czech tennis player Barbora Strycova 7-5, 6-4 in an hour and 46 minutes to enter the quarter-finals of the Australian Open here on Monday, January 23.
"I feel like it was really good for me to win on probably not my best day, which is always good," said the US player after the match, reports Efe.

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