Ashleigh Barty: World number one makes shock call to quit tennis

"When I finally won Wimbledon in 2013 I had a little bit of fire in my belly that was just gone," Bartoli told BBC Radio 5 Live Breakfast. "When you chase something that is so hard to achieve for so long, and you've finally done it - you feel drained. You feel empty. And for Ash, she had the Australian Open around the corner, she definitely felt that if she could win that would be the cherry on the cake.