Serena refuses to explain wheelchair photo

Serena Williams refused to offer an explanation about an image of her in a wheelchair that was shared on social media prior to the start of the French Open.

Former world number one Williams is struggling with a left knee injury – she played just one match on clay prior to arriving at Roland Garros – and was pictured in the chair while out with her family.

The 23-time grand slam champion, who had to fight from a set down to defeat Vitalia Diatchenko in round one on Monday, was not forthcoming when asked about the photo following her straight-sets victory over Kurumi Nara three days later.

"I'm not going to get into that. I'm playing, and all's good," said Williams, before adding that her knee felt "okay".

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Williams faces fellow American Sofia Kenin in the third round and, despite admitting to feeling a little rusty, has no doubt her condition will only continue to improve.

"I have had a tough year since I twisted my ankle in Australia. It's just been really tough after that," she said.

"So everything definitely feels a little bit harder than normal, but at the same time, I know that it's going to get better."

On Kenin, she added: "I know her game really well. She had a really great run in Australia, and I have been watching her. I think it will be a good match.

"She has a lot to bring to the table. She has a lot of excitement and she's a good player. She's so young, and she's such a good player. I'm actually looking forward to that match."