Serena, 36, was last in action 14 months ago when she clinched her 23rd grand slam singles title by winning the Australian Open. She gave birth to daughter Alexis Olympia on September 1 and has since been working her way back to fitness.

"It's been hard," Williams said in an interview with BBC Sport. "There have been so many days, even still, that I'm like 'how am I going to keep going?' But I keep going and I know that I might not be at my best yet but I'm getting there. As long as I'm moving forward, even if it's at a turtle's pace, I'm OK with that."

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