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Photo: BARRY BLAND/BARCROFT MEDIA
Mia Lines picked up a racket at the age of only one and is now gaining from the enormous experience of renowned tennis coach Rick Macci at his academy.
Macci has coached a series of Grand Slam winners but said he has never seen a more impressive player at the age of four than Mia, who is from Australia.
"I have seen hundreds of kids come through my school in the 25 years I have been doing this and I have never seen a four year old with such god-given talent," he said.
Stunned by the precision of Mia's ability to read the court and also because she can hit the ball from baseline to baseline, Rick is cautiously guarded about her potential due to her age.
"It is difficult to compare Mia to players I have coached like Venus and Serena Williams, Andy Roddick and Maria Sharapova," the 54-year-old said. "Mia's technique is incredible and what she is doing is bringing foot-work you can't teach to the table.
"What I would say is ask me if she can go all the way in five years and I will be able to tell you then.
"In the meantime my opinion is that she can not be any better than she is at this age."
This is the second one month stint that Mia has done with Macci, a seven time national US coach of the year, the first having been in July of last year when she was still only three.
"Well I found out my child was going to be a girl I ran round telling everyone that she is going to be a tennis player," said Mia's father Glenn.
"From the moment that she was born I insisted on working with her hand eye co-ordination and then at the age of one I gave her a tennis racket."
Mr Lines had her practising indoors with soft balls, until he took her outside onto his parents own tennis court.
"I have always been a tennis fan so I knew of Rick Macci. As she progressed year on year I wondered whether I had a special child, so I got in contact with Rick.
"We eventually got her to his Florida camp last year and this year has just confirmed what we have all thought," said Mr Lines, from Melbourne.
"I know nothing about ballet, nothing about swimming, but I do know something about tennis and I am just trying to guide her as best as i can.
"If she is good enough and she wants to do it then that is up to her. She drives the bus."
For Mia it is the thought of being the next Sharapova that is most appealing.
"My favourite part of my tennis exercises is the breathing, when I have to breath in before I hit the ball and exhale when I hit it," she said.
"It makes me think that I am Sharapova."