Serena Williams skips Hopman Cup opener due to knee injury

Perth: Serena Williams withdrew from her opening match at the Hopman Cup because of inflammation in her left knee, an early setback in preparations for her Australian Open title defense.

The No 1-ranked Williams practised on Monday ahead of her scheduled season opener against Elina Svitolina of Ukraine in the international mixed team competition at Perth Arena, but withdrew from the match and was replaced by Vicky Duval in the US team.

Duval lost 6-4, 6-1 to Svitolina before Alexandr Dolgopolov beat Jack Sock 6-4, 6-2 to clinch the best-of-three Group A match for Ukraine ahead of the mixed doubles. Williams said she was confident she'd be able to join Sock in the U.S. team to play the Australia Gold team on Tuesday.

Hopman Cup tournament director Paul Kilderry said Williams felt pain in her knee on Sunday but wanted to practice again before making a decision on the match.

"She wanted to give herself every chance to play, she warmed up this morning but common sense prevailed and she just thought today she can't do it," Kilderry said.

After winning the Australia, French and Wimbledon titles in 2015 Williams had two months off after the U.S. Open, where she narrowly missed completing a season Grand Slam by losing to Roberta Vinci in the semifinals.

For the 20-year-old Duval, who returned to tennis in August after overcoming Hodgkin's lymphoma, filling in for Williams was a great opportunity.

"I was kind of nervous because I was filling in big shoes. But I had a really fun time today," Duval said. "I have a whole new outlook on life. I'm just really grateful to be back and do what I love. And I'm going to keep pushing until I get the results I want."

At the Brisbane International, 2015 finalist Grigor Dimitrov needed six match points before beating fifth-seeded Gilles Simon 6-3, 7-6 (10) to move into the second round. At the ASB Classic in Auckland, New Zealand, fourth-seeded Svetlana Kuznetsova progressed to the second round, leading 6-2, 1-1 when Mona Barthel of Germany retired from their first-round match.

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