The Czech said Jimmy Connors, John McEnroe, Ilie Nastase and Roger Federer were also a whole load of trouble at the same age - yet they matured and won a slew of majors.

Kodes who won the French Open in 1970 and 1971 then Wimbledon in 1973, said modern players were surrounded by coaches, advisers, physios and psychologists - yet the key components of becoming a winner had not changed in 50 years.

The 69-year-old said Kyrgios, the talented but temperamental Australian whose volatile behaviour on and off the court shook up this year's Wimbledon, definitely had the makings of a Grand Slam champion.

"I've seen him play. Kyrgios has great volleys, serves, everything. He plays a round game. He needs three more years and he might win," Kodes said.

"Look at Connors, McEnroe and Nastase when they were 20. They all behaved badly. Federer in the juniors was terrible, breaking racquets. The press would like to have Kyrgios behave like he's 28. But he's not, he's 20.

"You need time to get experience. When you are young, you don't think. You don't have any responsibility. You can take risks."

- Learning how to win -

Kodes, an inductee in the International Tennis Hall of Fame (ITHF), said self-belief, an array of "weapons" and, critically, deploying those skills at the right moment remained the difference between good players and champions.

"There are some people who say tennis is completely different from my era, but I don't agree. Either you stay back or you come in and make the points," said Kodes, who was known for his attacking groundstrokes.

"The key things are the same; the only difference is guys can hit harder, but even so, they can make mistakes at important moments.

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