Serena Williams has shared an insight into her first days of tennis-free life, posting a photo of herself tucked up in bed.

The 23-time Grand Slam champion played her last ever match on Friday night

Williams was overcome with emotion as she bid farewell to the sport, although did leave the door slightly open to returning one day

In her post-match press conference she said she would be opting for karaoke on the first day since bringing the curtain down on her glittering career.

But on Monday she showed fans what she got up to by posting a picture of herself asleep

She said that she wanted to spend her first day of retirement in the karaoke booth before insisting she is looking forward to exploring Serena 2.0.

Williams revealed in an interview with Vogue last month that she intends to 'evolve away' from tennis

The 40-year-old said after her final match: 'I'm ready to be a mom and explore a different version of Serena.

In her on-court interview, Williams appeared to leave the door slightly ajar to a comeback.

Williams had breezed past Danka Kovinic in the opening round of the Grand Slam before stunning World No. 2 Anett Kontaveit on Wednesday.