Australia's grand slam-winner Sam Stosur says Bernard Tomic must "knuckle down" if he is going to have any chance of fulfilling his enormous potential.
Davis Cup captain Pat Rafter has decided not to consider Tomic for Australia's opening Davis Cup tie against Taiwan in February due to what he believes is a questionable attitude towards representing his country.
The 20-year-old's dismal end to the year meant his ranking slid from number 27 in June to number 52.
When asked what advice she would give Tomic, Stosur said: "'What are you doing? Are you wanting to play tennis?
"'If you are, then give it 100 per cent because you only get one crack at it'.
"He's going to have to decide what he wants to do and how he's going to approach his career.
"Until that improves in a lot of people's eyes, he's going to have to deal with things like being dropped out of the Davis Cup team."
Stosur added it would be unfortunate to witness Tomic's undoubted talent go to waste.
"That's probably the most disappointing thing for a lot of people on the outside - that he's got this unbelievable tennis ability and he's not really using it at the moment," said the world number nine and US Open title winner.
"So I think everyone would like to see him knuckle down and do his best and see where that gets him."
AAPTags: sport, tennis, robina-4226, qld, australia First posted December 06, 2012 13:43:47