Lleyton Hewitt urges young Aussies Nick Kyrgios and Bernard Tomic to be true to their playing personalities.

The former world No. 1 makes his debut as Australian Davis Cup captain this weekend as the Aussies host the United States on the grass courts of Kooyong.

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Hewitt embraces the rebellious and flashy on-court disposition of his singles starters and says his job is to help the pair reach their full potential rather than try to change their temperaments.

"It is a big responsibility," Hewitt said. "But it's something that I look forward to doing. You've got to try to keep their personality and how flamboyant and flashy they are on the tennis court. But try and mold them into the best kind of people and tennis players they can be on the match court so that they can go out there and fulfill their potential."