As a baby, Britain's Lily Mills was given just a 50% chance of survival.
The probability of the 23-year-old going on to achieve what she has since would have been substantially lower.
Four days after she was born, Mills fell critically ill and was taken to hospital, where she was put on a life support machine.
She was diagnosed with meningitis and later septicaemia, and if she survived, would have severe brain damage, her mother Tallulah Bayley was told at the time.
Tennis has offered Mills opportunities she would likely not have otherwise had.